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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Your air conditioner is humming, the fan spins slowly or not at all, and the house is getting warmer by the hour. Nine times out of ten that is a tired run capacitor — a small round can that gives the compressor and fan motor their starting push. Buying the right one is mostly about matching two numbers printed on the old can: the microfarad rating (the capacitance, written like 45/5) and the voltage rating. Get those two right and the swap takes minutes; get them wrong and you are back outside with a screwdriver. Below are the nine replacements worth your time, ranked so the strongest all-rounder sits first.
I’m Min — the founder and writer behind Gadgets Feed. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
You can swap a capacitor without an electrician’s license, but you must read the label on your old unit before you order. This guide shows you exactly which capacitor for ac matches your compressor and fan motor.
Our Picks at a Glance
![[UL Listed] BlueStars 45+5 uF 45/5 MFD 370V or 440V AC Dual Run Capacitor](https://m.media-amazon.com/images/I/41PLWeNAJ-L.jpg)
How To Choose The Best Capacitor For AC
The biggest mistake first-time buyers make is ordering the capacitor they remember from last time instead of reading the label on the one that just died. Ratings vary by condenser, and a 35/5 can will not stand in for a 45/5 can, no matter how similar the two look in a product photo. Before you buy anything, kill the breaker, pull the disconnect and photograph the old capacitor’s printed label.
Match the two MFD numbers, not just the first one
A dual run capacitor carries two ratings in one can — for example 45/5 means 45 microfarad for the compressor side and 5 microfarad for the fan side. Some units step that fan side up to 7.5, which is exactly why the BOJACK 45+7.5 and the 70/7.5 picks exist here. Write down both numbers from your label, in the order printed.
Decide whether 370V or 440V is right for you
A 370V capacitor handles a compressor circuit rated at 370 volts; a 440V one carries a higher ceiling. Several picks here, including the BlueStars and the QYCKFIXR, state they replace both 370 VAC and 440 VAC units, which removes one decision from your plate. If your old label reads 440V, stay at 440V.
Check physical space inside the condenser cabinet
These are round cans that drop into a metal strap, and height matters because the cabinet lid has to close over them. The Titan HD runs smaller than most of the group, while the HUAREW 70/7.5 stands notably taller at 4.92 inches. Measure the bracket opening with a tape measure before ordering.
Quick Comparison
| Model | Best For | Capacitance | Max Voltage | Diameter | Amazon |
|---|---|---|---|---|---|
| Frienda 2 Pcs 45/5 µF★ Best Overall | Best Overall | 45/5 MFD | 440 volts | 4.92 in | Amazon |
| GE Genteq 27L880Drop-In Match | Drop-In Match | 45/5 MFD | 370 volts | 2 in | Amazon |
| BlueStars 45+5 uFWidest Compatibility | Widest Compatibility | 45/5 MFD | 440 volts | 2.36 in | Amazon |
| BOJACK 45+7.5 uF | Bigger Fan Motor | 45/7.5 MFD | 440 volts | 2.56 in | Amazon |
| HUAREW 70/7.5 uF | Heavy Compressor Loads | 70/7.5 MFD | 450 volts | 2.64 in | Amazon |
| QYCKFIXR 45+5 uF | Long Coverage | 45/5 MFD | 440 volts | 2.52 in | Amazon |
| Titan HD 45+5MFD | Compact Fit | 45/5 MFD | 440 volts | — | Amazon |
| VEXUNGA 35+5 uF (2-Pack) | Budget Two-Pack | 35/5 MFD | 440 volts | 1.97 in | Amazon |
| AmRad USA2236 | Made in the USA | 45/5 MFD | 440 volts | — | Amazon |
In‑Depth Reviews
1. Frienda 2 Pcs 45/5 µF 45+5 MFD Dual Run AC Capacitor 370/440V UL Certified
Our pick — 4.5+★ from 900+ verified ratings; the strongest balance of quality and price.
Two UL-certified 45/5 cans in one box, so a second failure never catches you outdoors with a screwdriver.
This is the strongest all-rounder for the most common condenser in America: a unit calling for 45/5 MFD. It carries a 440-volt ceiling, so it covers both 370-volt and 440-volt circuits, and it is built to recognized standards including EIA-456-A and IEC 60252-1 — the benchmarks that govern how a motor run capacitor behaves under load. Its working range runs from -40℉ to 158℉ (-40℃ to 70℃), which means a rooftop condenser in a cold snap or a full-sun July afternoon both sit inside spec.
What wins here is the second can in the box. Two of them ship in the box at once, and the head-to-head proves it: Frienda ships 2 items where the GE Genteq ships 1. That matters because capacitors are the single most common AC failure point, and the spare rides in your garage for the next outage instead of triggering another order and another wait. It also measures 4.92 inches in diameter against the GE’s 2 inches, so it fills a wider bracket — check your strap before you commit.
What buyers keep coming back to is plain functionality: it does the job, it fixes the run problem, and it goes in fast. Owners who swapped theirs describe the replacement taking about five minutes. The honest catch sits in the lifespan data — some of these run three years while others quit inside 13 months, so treat the spare as part of the value, not a bonus. Compatibility is broad but you should still verify your original part number, since it cross-references C3455R, 97F9895, Z97F995, 27L880 and TRCD455 among others.
What earns it the top slot
- Two capacitors per box — a spare ready for the next failure
- 440-volt cap covers both 370V and 440V circuits
- UL Certified and built to EIA-456-A and IEC 60252-1
- Runs from -40℉ to 158℉ so weather is not the weak link
- Cross-references C3455R, 97F9895, Z97F995, 27L880 and TRCD455
Where it asks you to check first
- At 4.92 in across it does not suit a narrow bracket
- Lifespan reports scatter from 13 months to 3 years
- You must confirm your original MFD rating before ordering
Buy this when: your label reads 45/5 MFD and you would rather have a spare on the shelf than a second shipping delay in August heat.
Measure before you do: that 4.92-inch diameter needs a wide enough strap, and a cramped cabinet will not take it.
2. GE Genteq Capacitor round 45/5 uf MFD 370 volt 27L880
The smallest can in the group at 2 inches wide, built in North America and made to drop straight in.
If your condenser’s bracket is tight, this is the pick that fits where others crowd the lid. It measures 2 inches wide by 3.78 inches tall — against the Frienda’s 4.92 inches, that is a far narrower footprint for a cabinet with little spare room. The body is polypropylene with a +6% / -5% tolerance around its 45 microfarad rating, and the 370-volt ceiling suits the many older units that were never rated past 370V in the first place.
It drops in as a direct replacement for GE part number 97F9895 (also sold as Z97F9895), with no rewiring or adapters. Buyers overwhelmingly praise quality over every other factor, which for a component this simple is the whole ballgame — the can either hold its rating under a hot compressor or it does not. Installation draws the next-biggest share of praise, and it goes in the way any three-terminal can does, with Herm for the compressor, Fan for the fan and C for the common line.
The trade-off is the one number that is not flexible: 370 volts. If the label on your old capacitor reads 440V, do not buy this one down to save a little — the voltage ceiling is the spec that has to match or exceed your circuit. Longevity is the other honest note; the spread on these runs from about a month to almost two years, which is typical of the category rather than a knock on GE.
The fit argument: at 2 in wide, this is the answer when the replacement bracket has no slack — the Frienda’s 4.92-inch body simply will not squeeze into a narrow strap.
The match argument: it is the direct GE cross-reference for 97F9895, so if the dead can in your hand carries that part number, you already know the answer.
Right call if: your old label says 370V and your cabinet leaves you almost no room to work.
Wrong call if: the old capacitor reads 440V — this one tops out at 370 and should not be pushed past it.
3. [UL Listed] BlueStars 45+5 uF 45/5 MFD 370V or 440V AC Dual Run Capacitor
Cross-references more part numbers than anything else here, so the odds your old can is on the list run high.
Three terminals, three labels, one job: Herm feeds the compressor, Fan feeds the fan, and C takes the common line. This can carries a 45/5 MFD rating at a 440-volt ceiling, so it runs both your compressor and fan motor. The printed spec sheet is longer and more specific than most: it lists a 10,000 AFC safety rating (the fault-current rating, meaning how much short-circuit current it can safely interrupt) and a working range of -13℉ to 158℉ / -25℃ to 70℃, so it handles cold winters and hot rooftops. It is listed to UL & CUL, CEL and TÜV SÜD, EIA-456-A and IEC 60252-1:2001.
Where it beats the field is the compatibility list. Cross-referenced numbers stretch from 97F9895 and Z97F995 through 27L880, TRCD455, TRCFD455, PRCFD455, 27L889, 97F9851, HC98KA046 and TT-CAP-45/5/440R, all the way to CAP050450440RT and 00662441180262. If you have been burned by a photo that looked right and a listing that was not, that printed list is worth scanning before you order. The can itself measures 2.36 inches in diameter by 4.73 inches in height, which sits between the GE and the Frienda on width.
Quality, installation and value all score well, making it a solid mid-priced part. Durability is the mixed note — it holds up well for some units and only four months for others, which is the recurring story with run capacitors in general. One detail worth checking before you order: some buyers report the physical size running differently from what a photo suggests, so measure your bracket opening and compare it to that 2.36-inch figure instead of trusting the image.
Compatibility list first: the replacement sheet runs past twenty part numbers, which is why buyers with an obscure condenser model gravitate here.
The caveat to size: a 2.36-inch body fits most brackets, but that is the number that has to match yours, not the one in the product photo.
Best for: anyone whose old capacitor part number has been hard to pin down and who wants a printed cross-reference to check against.
Skip if: your bracket is already cramped around a 2-inch can — this one is wider by a small but real margin.
4. BOJACK 45+7.5 uF 45/7.5 MFD ±6% 370/440 V AC CBB65 Dual Run Capacitor
For condensers that call for 7.5 on the fan side and have been stuck buying the wrong 45/5.
Not every unit wants 45/5. Plenty of condensers step the fan half up to 7.5 microfarad, and this can fills that gap with a 45/7.5 MFD rating at ±6% tolerance and a 370/440-volt ceiling, so it serves both circuit ratings without a second purchase. It is built to a 10,000 AFC safety rating (the short-circuit current it can interrupt) and runs from -40℃ to +70℃ / -104℉ to +158℉, a wide enough window for a rooftop in nearly any climate. Its body measures 2.56 inches in diameter by 3.74 inches in height.
Owners consistently land on the same experience: it works, it takes less than five minutes to install, and the fit lands where it should. The most useful signal here is the cooling side — buyers describe it restoring cooling performance and saving them the cost of a repair call. In Texas heat the reach extends out to about two years for some units, though others quit inside three months. That spread is the honest truth of run capacitors everywhere, and it is why a spare or a second unit is not wasteful thinking.
One thing to be firm on: this is not a substitute for a 45/5 can, and a 45/5 can is not a substitute for this. The fan microfarad rating has to match your motor. Check the printed label on the old can before you order — if the second number reads 5, go to a 45/5 pick; if it reads 7.5, this is yours.
Why the 7.5 fan rating matters
- 45/7.5 MFD fills the rating gap that 45/5 cans leave open
- 370/440 V ceiling serves both circuit ratings
- 10,000 AFC safety rating and a wide temperature range
- Restores cooling and the fan start in minutes
Honest notes on lifespan
- Reports stretch from about two years in Texas heat to three months
- Only correct if your fan side really is 7.5 MFD
- At 2.56 in wide it needs a bracket that accommodates a slightly fatter can
Reach for this if: the second number on your old label is 7.5, not 5 — that single digit decides it.
Look elsewhere if: your label reads 45/5, where a mismatched fan rating will leave the motor running wrong.
5. 70/7.5 uF 70+7.5 MFD ±6% 370V/440V CBB65B AC Capacitor Dual Run Round
The big-load specialist: a 70 microfarad compressor side for units that need far more starting push.
Most of this list lives around 45 microfarad. This one carries 70. That is a completely different compressor load, and the comparison proves it — the 70/7.5 states 70 microfarad where the GE Gientq tops out at 45, and it also carries a 450-volt maximum against the GE’s 370. If your unit’s label reads 70/7.5, nothing else on this page will do the same job, which is why it earns a spot despite a niche rating.
It is a CBB65B composite unit with ±6% tolerance, a working range of -40℃ to 70℃ and an S1 safety protection level. Dimensions run 2.64 inches wide by 4.92 inches tall — that height is the tallest on the list alongside the Frienda, so the cabinet lid is the thing to check before you order. The body is copper, and the 440/450-volt ceiling serves either circuit rating.
Owners mention it simply keeps working — many say it is still running past a year, and they appreciate how much load it takes off the condenser motor and compressor with everything balanced. Quality and value track close behind. The catch is availability of the rating itself: 70/7.5 is a less common spec than 45/5, so fewer buyers need it and the matching has to be exact. Tolerance drift over time is the normal reason these get replaced, not a defect.
The case for the upgrade: if your compressor really was rated at 70 microfarad, a 45/5 can is not a close enough match — this is the number that was designed for that load.
The measurement warning: 4.92 inches of height is the tallest on this list, so clear the lid before the order goes in.
This one earns its place if: your condenser calls for 70/7.5 MFD and you have been sorting through 45/5 listings that never fit.
Look past it if: your label reads 45/5 — overshooting the compressor microfarad rating is not the safer choice.
6. QYCKFIXR AC Capacitor 45+5 uF 45/5 MFD ±6% 370V/440VAC CBB65 Dual Run
The 45/5 can that ships with ten years of coverage printed on the listing.
Ten years of coverage. That is the single line this can leads with, and it is the clearest answer to the one genuine worry with any run capacitor — that it fails long before the compressor does. It is a 45/5 MFD unit at a 440-volt ceiling that replaces both 370 VAC and 440 VAC capacitors, built to EIA-456-A and IEC 60252-1:2001 with a 10,000 AFC safety rating. The working range runs -40℃ to +70℃ / -104℉ to 158℉.
It cross-references the same long list the BlueStars does — 97F9895, Z97F995, 97F9895BZ3, 27L880, TRCD455, TRCFD455, 27L889, 97F9851, HC98KA046, TT-CAP-45/5/440R, CAP050450440RT and more. The body measures 2.52 inches in diameter by 3.94 inches tall, and it snaps into a bracket rather than a through-hole. The three terminals carry the same Herm, Fan and C labels as the rest of the group.
Performance in service tracks the pattern you want: it fits, it installs cleanly, and the cool air comes back. Buyers describe the house cooling again within a couple of hours of the swap. Quality and value score strongly, and the direct-replacement feel is what gets mentioned. The small print is that a coverage promise is only as good as the process for claiming it, so keep your order record somewhere you can find it two summers from now.
Where it leads
- Ten years of coverage stated on the listing
- Replaces both 370 VAC and 440 VAC capacitors
- Built to EIA-456-A and IEC 60252-1:2001
- Broad cross-reference list for hard-to-match units
What to keep in mind
- You need the order record to use the coverage
- Snap-in mounting suits a bracket strap, not a through-hole setup
- Still a 45/5 rating — wrong if your fan side is 7.5
The right pick when: the idea of a second failure with no replacement worries you more than the spec sheet does.
Shop past it when: you want a spare in the box more than a coverage promise — the two-pack picks answer that differently.
7. Titan HD 45+5MFD, 440/370V, Round Capacitor
The lighter can at 8 ounces that squeezes into tight cabinets most full-size capacitors crowd.
Some condenser cabinets leave almost no clearance above the capacitor strap. This one answers that with a body that runs smaller than its neighbors, and buyers call that out — several note it is significantly smaller than the alternatives, which is a feature for a cramped cabinet and a surprise for anyone expecting a full-size footprint. It carries a 45/5 MFD rating at a 440/370-volt ceiling, ships at 8 ounces, and mounts through-hole.
Buyers praise how it performs in service. Installation is a quick job, buyers are glad it is made in the USA, and it fits where it should. A stable capacitor for the long haul is the phrase that keeps coming back from people who have run it through a full cooling season. One buyer reports a 10°F drop in house temperature after the swap. The brand printed on the body is Packard, manufactured by Diversitech, and the part number to cross-reference is PRCFD455.
There is one habit worth keeping: this one is chosen for compactness, so if your bracket was built around a standard-size can, measure the strap opening. A smaller can in a loose bracket can rattle or sit unevenly. Check the strap tension as you close the cabinet back up.
Built for: a tight clearance where a standard-size capacitor will not seat cleanly under the lid.
Look at the Frienda instead if: you have bracket room and would rather trade the smaller body for a spare can in the box.
8. VEXUNGA 2PCS 35+5uF 35/5MFD 370V or 440V Dual Run Start Round UL Listed
A 35/5 two-pack for the units that were never rated at 45 microfarad in the first place.
This is the one pick built around a 35/5 MFD rating rather than 45/5. Two cans ship at once, they serve both 370-volt and 440-volt circuits, and they carry a UL listing. The body measures 1.97 inches wide by 3.35 inches tall — the smallest footprint anywhere in this guide — so it seats comfortably in a snug cabinet. Frequency is stated at 50/60 Hz (the standard AC power frequency), and the terminals are labeled Herm, Fan and C as you would expect.
Condensers do not all run the same microfarad rating. If the label on your old can reads 35/5, a 45/5 replacement here is not the safe overshoot some buyers assume; the compressor wants the capacitance it was designed around. Get the rating right and this one works: buyers describe it as flawless, quality is the second most-praised trait, and it runs cleanly in a heat pump.
The caveat is durability. Some of these units lose capacitance quickly — within an hour of use is the pattern several buyers describe — which tells you the second can in the box is the real value here, not a bonus. Treat this as the pair you buy so the next failure costs you nothing but the ten minutes on the roof. Cross-references include 97F9834, Z97F9834, HC98JA036, P291-3553R, TRCFD355, C3355R and more.
Where the value hides
- Two 35/5 cans in one box
- The smallest body on the list at 1.97 in wide
- Serves both 370 VAC and 440 VAC
- Runs cleanly in heat pump applications
The limiter to know about
- Durability reports include capacitance loss after about an hour of use
- A 35/5 rating is only correct if your label matches it
- Do not buy this hoping it will stand in for a 45/5 unit
Right on the money if: your label reads 35/5 and you want the second can ready for a repeat.
Not the one if: your old capacitor says 45/5 — this will fit the bracket but not the compressor’s rating.
9. AmRad USA2236 45 + 5 uf/Mfd Round Dual Universal Capacitor
American-made at 8 ounces, for buyers who would rather buy the part once than repair it twice.
If you have already replaced a run capacitor that failed early, the appeal of paying more for a US-made one gets sharper. This is the premium pick in the group, and the spec sheet backs the positioning: 45/5 MFD at a 440-volt ceiling, 8 ounces, polypropylene body, part number USA2236. It carries the same 370/440 VAC range so it serves either circuit rating.
Buyer feedback on this one is consistent. Quality is what gets praised above everything else, with functionality close behind, and made-in-America a strong third. People install it in two minutes and report their AC up and running again within a day. Then there is the cost frame: owners put it plainly — even paying for this one beats calling an HVAC professional out for the same job. Durability sits as a mentioned strength rather than a worry, which is unusual for this category.
The Amazon listing is a global-store item, so the small print carries a note that dimensions are approximate and subject to change. If your bracket clearance is tight, treat that as a real check rather than lawyer-speak — measure the strap opening and the lid clearance before ordering. That is the one place this pick can trip you up, and it is easy to avoid.
The premium argument: it leads on build feel and durability mentions, and a two-minute install with AC back within a day is the fastest recovery in the group.
The check to run first: the listing warns dimensions are approximate and subject to change, so confirm clearance yourself.
Worth the premium if: you have replaced a cheap capacitor once already and want the American-made part this time.
Avoid for tight cabinets: with dimensions flagged as approximate, a snug bracket is where this one can bite.
Understanding the Specs
Microfarad Rating (MFD)
The microfarad number is the capacitance — how much starting push the can delivers to a motor. A dual run capacitor splits that into two figures, compressor first and fan second, so 45/5 means 45 to the compressor and 5 to the fan. Match both numbers to the old label exactly; uprating the compressor’s figure to be “safe” is not a safe habit.
370V Versus 440V
Voltage is the ceiling the can is rated for. A 370-volt part suits a 370-volt circuit, and a 440-volt part covers both — which is why so many picks here list 370/440. If your old label reads 440V, buy 440V; if it reads 370V, either works, and going higher is the flexible direction.
Tolerance Percentage
Tolerance is how far the true capacitance can drift from the printed rating, written as a plus-or-minus percentage. A ±6% part can sit within 6% of its nameplate figure, and that is the number manufacturers publish on most CBB65 cans. Tighter tolerance means the part behaves closer to the spec the compressor was designed around.
Herm, Fan and C Terminals
Every dual run can here has three terminals on top: Herm (H) for the compressor motor, Fan (F) for the fan, and C for the common line. Photograph the wiring before you pull the leads — that photo is faster than any diagram when you put the new can in.
Safety Rating (AFC)
The AFC figure is the fault current the capacitor can safely interrupt, and several picks here are rated 10,000 AFC. It is a safety number, not a performance number, meaning it describes how the can behaves if a fault occurs rather than how hard it pushes the motor.
Physical Size and Mounting
These are round cans that sit in a metal strap, and mounting type varies — through-hole, surface, and snap-in all appear in this list. Height is what interacts with the cabinet lid; diameter is what must clear the bracket. Measure both against the old capacitor before you order.
FAQ
Can I use a 440V capacitor in place of a 370V one?
How do I know whether my AC needs 45/5 or 45/7.5 MFD?
Is it safe to replace a run capacitor myself?
What do Herm, Fan and C mean on a dual run capacitor?
How long does an AC capacitor usually last?
Will the capacitor fit if the dimensions look smaller than my old one?
What does the dual run rating actually split between?
Do I need to match the part number or just the MFD rating?
Is a capacitor with 10,000 AFC better than one without a stated rating?
Can I swap a 35/5 capacitor for a 45/5 one?
Does the operating temperature range matter where I live?
Final Thoughts: The Verdict
For most homes, the winning capacitor for ac is the Frienda 2 Pcs 45/5 µF. It matches the most common MFD rating, carries a 440-volt ceiling for both circuit types, holds a UL certification, and puts a spare can in your garage for the next August failure. It sits at 4.5+ stars across 900+ ratings, and the second can in the box is what earns it the top slot.
If your bracket is narrow and your label reads 370V, reach for the GE Genteq 27L880 — at 2 inches wide it fits where the Frienda cannot. For a fan side rated at 7.5 microfarad, the BOJACK 45+7.5 is the only correct answer on this list. And if you have already replaced a cheap capacitor once and want the American-made part, the AmRad USA2236 is worth the step up.
One last nudge: photograph the label and the wiring on your old capacitor before you order anything. That photo settles the MFD rating, the voltage ceiling and the terminal order in one frame — and it means the first hot weekend of summer does not catch you waiting on a second shipment.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of November 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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