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Old 10-07-2016, 12:01 PM   #1
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SF-30 to SF-35 Suburban Furnace Upgrade

Can I replace a SF-30 30000 BTU Suburban furnace with a SF-35 35000 BTU unit?

My SF-30 shook extremely last night and shutdown. Now cool air blows with no heat. Since its 5 years old, I am replacing and will repair this unit as a backup. As I already have 4 interior cabin vents, can I upgrade to a SF-35? The unit is running on a 20 amp fuse and this seems like a better option for our 650 square foot space. The Suburban installation guide specs (except for vent specs) are the same for both units. Thanks. John

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Old 10-08-2016, 08:06 PM   #2
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Since you already know about the venting and correct, it should be fine. Keep in mind that over-sizing can produce short cycling of unit. Do a heat lose calculation to verify your thoughts!

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Old 10-08-2016, 08:32 PM   #3
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Rv's are notoriously drafty and a 5k BTU difference shouldn't affect cycling. If it does, find a thermostat with adjustable hysteresis.
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Old 10-08-2016, 08:39 PM   #4
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Or just add a duct to your basement, but if the dimensions are the same I say go for it...
Rockwood #8289 WS 2012
F250 6.0 / Husky 16k
With 4 point leveling system
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furnace, suburban, upgrade

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