Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.11 Best 90000 BTU Furnace | True 90000 BTU Without the Noise

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The Goodman GR9T961004CN delivers a genuine 96% AFUE rating with a two-stage gas valve that runs on low most of the time, only kicking into high gear when the outdoor temperature plummets. The aluminized steel primary heat exchanger resists corrosion better than standard steel, extending the furnace’s service life in humid climates. Its multi-speed ECM motor ramps up slowly, preventing the sudden blast of cold air that older single-stage units push through the vents.

Buyers consistently report that this 100,000 BTU model heats spaces faster than the 80,000 to 100,000 BTU units it replaces while running half as often. The 17.5-inch-wide cabinet fits most standard upflow or horizontal applications, though installation requires an LP conversion kit if you’re using propane. Multiple owners noted the LED display can be tricky to read with the front cover attached, so run your setup checks before sealing the panel.

For a whole-home replacement furnace that combines condensing efficiency with genuinely quiet operation, this Goodman two-stage unit offers the strongest blend of durability and comfort control in the mid-premium tier.

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The Goodman GR9T961205DN scales up the two-stage, 96% AFUE formula to 120,000 BTU with a 24.5-inch-wide cabinet designed for larger homes and higher airflow demands — up to 2,000 CFM. This model is R-32 refrigerant-ready for future HVAC system integration, giving it an edge for homeowners planning a coordinated heat pump and furnace setup. The aluminized steel primary heat exchanger and multi-speed ECM motor mirror the build quality of the smaller-capacity Goodman two-stage line.

Buyers who installed this unit as a direct replacement for 15- to 20-year-old furnaces consistently praise the dramatic reduction in run time and the smoother temperature hold. The cabinet is 12 inches shorter than older full-size furnaces, so a plenum spacer may be necessary to bridge the gap to the existing ductwork. Several reviewers emphasized the importance of pairing this furnace with a true two-stage thermostat to unlock the full benefit of low-stage operation.

For homeowners with a heat-loss calculation exceeding 100,000 BTU, this 120K model delivers the same robust two-stage condensing technology without forcing you into a commercial-grade price bracket.

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The Rinnai EX38DTP is a direct-vent propane heater that uses modulating technology to fine-tune its heat output between low and high, maintaining a room temperature within a narrow band rather than cycling on and off like a single-stage furnace. Its forced-air convection system pulls in combustion air from outside, making it safe for tightly sealed modern homes. The cool-to-the-touch cabinet and self-diagnostic electronics add a layer of safety for homes with children.

Buyers using this 36,500 BTU unit in spaces around 450 square feet report that the variable output is noticeably quieter and more even than older sealed-combustion heaters. The unit works with an optional wall thermostat kit that integrates with NEST for scheduling and freeze protection. A few owners noted the initial setup may involve replacing a recalled part, so verify the serial number with Rinnai before installation.

For a high-output direct-vent propane solution that modulates its flame to match real-time heat demand, the EX38DTP is the most refined option in the premium wall-furnace category.

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The Rinnai EX22DTP packs the same modulating technology as its larger sibling but in a smaller footprint designed for 1,600-square-foot coverage on propane. The unit’s self-diagnostic electronic controller continuously monitors combustion and will auto-shutdown and display error codes if ignition fails. The programmable thermostat lets you set specific temperature targets, and the unit can integrate with Wi‑Fi systems for remote adjustments.

Owners consistently highlight how evenly the EX22DTP distributes heat compared to the log-style gas stoves it often replaces. A common concern is the limited wall-thickness compatibility — the shortest vent option fits standard walls, but thicker exterior walls require an additional vent kit purchased separately. Several buyers recommend hiring an HVAC professional for the initial installation to avoid gas-line issues.

If you need modulating precision in a mid-sized area and prefer the efficiency of sealed-combustion propane heating, this Rinnai model provides excellent temperature regulation with minimal energy waste.

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The Goodman GR9S960803BN is a single-stage, 96% AFUE condensing gas furnace that delivers 80,000 BTU in an upflow or horizontal configuration. While single-stage might feel basic compared to two-stage models, the high AFUE rating means this unit still wastes very little fuel — and the multi-speed ECM motor helps reduce the temperature overshoot that plagues older single-speed blowers. The 17.5-inch-wide cabinet fits standard utility closets.

Buyers replacing 10- to 15-year-old 80% AFUE furnaces with this unit see immediate drops in their gas bills. A few owners flagged that the product listing can confuse propane vs. natural gas compatibility — confirm your fuel type before purchase, as an LP conversion kit is required for propane installations. The 10-year parts warranty applies only when the furnace is installed by a qualified HVAC contractor and registered online.

For a straightforward whole-home replacement that gives you the energy savings of a condensing furnace without the complexity of two-stage controls, this Goodman single-stage is the most cost-effective 80K-plus option in the mid-range bracket.

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The Rinnai EX11CTP is a discontinued-but-still-available direct-vent wall furnace rated for 11,000 BTU with a seven-stage modulating gas valve that matches heat output to the exact needs of the room. The unit includes an enameled tray humidifier to add moisture to dry winter air, a feature not found on most forced-air wall heaters. Its variable-speed inducer motor and pressure switch maintain stable combustion regardless of outdoor wind conditions.

Buyers in tiny houses and small cabins (around 400 square feet) report that the EX11CTP heats the entire space to 68°F even when outdoor temps drop to -18°F. The installation is relatively straightforward if you watch a YouTube guide, but the printed manual is sparse on detail. A few owners noted the unit displays an “L” code for reduced mode that isn’t fully documented in the manual.

For a compact, modulating propane heater that includes humidity control and near-silent operation, this Rinnai wall furnace remains a capable choice despite its discontinued status.

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The Mr. Heater MHU125NG is a hanging forced-air unit heater rated for 125,000 BTU with natural gas input, covering up to 5,000 square feet. Unlike residential ducted furnaces, this unit is designed for open spaces like workshops, garages, and basements — it hangs from the ceiling and blows warm air directly downward. The electronic ignition and powered exhaust eliminate the standing pilot, improving safety and efficiency.

Owners using this heater in 1,200- to 1,500-square-foot shops report that it warms the space rapidly and holds temperature well even when garage doors are occasionally opened. The unit ships with an LP conversion kit, so switching to propane is straightforward. A minority of buyers experienced circuit board or limit switch issues, but newer production units seem to have addressed the earlier reliability problems.

For a budget-conscious shop heating solution that moves massive air volume without the ductwork of a central furnace, the MHU125NG offers the best cost-per-BTU ratio in the mid-range hanging-heater segment.

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The Cooper & Hunter 9,000 BTU PTAC combines a packaged terminal air conditioner with a 3.5 kW electric heater, making it a year-round climate solution for hotel rooms, apartments, and dorms. Unlike gas furnaces, this unit uses R-32 refrigerant and a 230/208V power supply to deliver both cooling and heating through a single through-wall sleeve. The included wireless smart kit enables app-based scheduling and remote temperature control.

Buyers replacing older PTAC units in 16×26-foot rooms report quieter operation and more even temperature distribution compared to legacy brands. The unit ships via freight and arrives with the separate sleeve requiring a two-person installation. Some owners noted that the remote control doesn’t function when the unit is operated exclusively through the app, so pick your primary control method early.

For multi-family or commercial spaces needing a drop-in PTAC replacement with smart control and both heating and cooling, this Cooper & Hunter model delivers reliable performance at a competitive mid-range price point.

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The Suburban SF-35VHQ is a low-profile, ducted LP gas furnace designed specifically for RV and trailer installations where vertical space is limited. It can be mounted in either vertical or horizontal orientation, and it uses direct spark ignition with sealed forced-draft combustion for reliable lighting at altitude. The unit requires a separate exterior access door (Suburban #6258xxx) for outside service access without removing the furnace from the RV.

RV owners replacing failed Suburban 35F furnaces with this model report perfect fitment into existing ducting and outside covers, though a few noted the unit is not quieter than the original. The exhaust port sealant can degrade over time, so securing the outside access door properly is critical to prevent moisture intrusion. Buyers in cold climates like Wisconsin confirm the 35,000 BTU output keeps a standard RV cozy even in single-digit temperatures.

For RV and travel trailer owners looking for a ducted furnace replacement that fits horizontal or vertical cavities without reengineering the cabinet, the SF-35VHQ is the correct ducted solution in the mobile-heating mid-range.

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The Empire DV215SGXLP is a cast-iron, direct-vent wall furnace that operates on LP gas using piezo ignition — no electricity required. This makes it ideal for off-grid cabins, ice fishing shacks, and rooms where wiring a thermostat or blower motor is impractical. The slim cabinet (20.25 x 9.5 x 25 inches) mounts flush against an exterior wall and vents directly outside through a 6.25-inch opening.

Buyers using this unit in small spaces and replacement installations for 30-year-old Empire heaters appreciate the near-identical footprint and the simple controls. The unit ships without a thermostat, so you will need to purchase one separately. A few customers reported pilot-light issues out of the box, highlighting the importance of buying from an authorized dealer for warranty support — some third-party listings are not Empire-authorized sellers.

For a budget-friendly, zero-electricity propane heater that relies solely on natural convection for heat delivery, the Empire DV215SGXLP is the entry-level champion in the direct-vent wall-furnace category.

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The Suburban NT-20SEQ is a direct-discharge LP gas furnace that does not require ductwork — it blows air directly into the RV’s living space through an attractive front grille. Its compact dimensions (21.25 x 9.5 x 9.5 inches) and low amp draw (2.7A at 12V) make it a favorite for van conversions, truck campers, and pop-up trailers where space is at a premium. The direct-discharge design is ideal for zone heating smaller mobile quarters.

Buyers building out vans appreciate the nearly silent exhaust and the ease of installation compared to diesel heaters, but several noted that the unit arrives without installation screws or an owner’s manual. Some units required fan-blade trimming to eliminate rubbing noise against the housing, indicating inconsistent manufacturing tolerance. The 14-inch duct option expands its placement flexibility, and the two-stage propane regulator is a required external component.

For RV and van-dweller budgets that prioritize compactness and low power consumption over raw heat output, the NT-20SEQ is the most space-efficient budget option in the mobile-heating segment.