35,000 BTU and up is for long trailers, fifth wheels, motorhomes and winter camping. These furnaces move the most air and draw the most current, so the amp figure matters more here than in the smaller sizes.
Prices were last checked November 4, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Full ranking 8
- Suburban SF-35VHQ (2588A)#1 of 8Full review
The standard replacement for a 35,000 BTU Suburban SF furnace where the exterior service door stays.
Amazon $929.99$929.9935,000 BTU8 A- - KingRVer HF35-E 35,000 BTU#2 of 8Full review
The cheapest 35,000 BTU furnace per BTU for a 28 to 38 ft trailer, on trust in a new brand.
Amazon $599.97$599.9735,000 BTU-320 CFM - Suburban SF-42VHQ (2592A)#3 of 8Full review
For big fifth wheels and motorhomes that need a single large furnace.
Amazon $1,138.76$1,138.7640,000 BTU9 A- - Suburban SF-42VHFQ#4 of 8Full review
For a 40,000 BTU furnace in an RV with no exterior door and a long duct run.
Amazon $1,185.98$1,185.9840,000 BTU-- - Fogatti RF035A0N 35,000 BTU#5 of 8Full review
A low-priced 35,000 BTU furnace with variable output for a cold-weather trailer.
Amazon $699.99$699.9935,000 BTU-320 CFM - Fogatti RF035AR 35,000 BTU#6 of 8Full review
The ducted version of the Fogatti 35,000 BTU furnace.
Amazon $699.99$699.9935,000 BTU-320 CFM - Suburban SF-35VHFQ (2587A)#7 of 8Full review
For a 35,000 BTU swap where the RV has no exterior furnace door.
Amazon $1,230.63$1,230.6335,000 BTU8.5 A- - Dometic DFLD40121#8 of 8Full review
For a large motorhome or fifth wheel with a doorless Dometic furnace to replace.
Amazon $1,155.54$1,155.5440,000 BTU--
