New 2 Stage Furnace - Thermostat Set Back


Old 05-07-04, 09:43 PM
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New 2 Stage Furnace - Thermostat Set Back

Recently, I replaced an old single stage furnace with a new 2 stage v.s. furnace (Bryant MAV355). Based on the recommendation on the contractor, I did not replace my thermostat (single stage thermostat), however, the contractor suggested that the temperature be set at a single setting and to not reduce the tempature during the day. I did set back the temperature with the single stage furnace and am just looking for your thoughts on what to do with a two stage furnace. Thank you very much.

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Old 05-08-04, 12:01 AM
hvac4u's Avatar
Join Date: Aug 2001
Location: NW atlanta
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2 stage furnace should have a 2 stage tstat in my opinion. if not, there is probably a jumper in place on the board that cycles the stages.

by using a setback tstat, the unit would be in high fire during warmup, thereby possibly costing some of the savings from the setback feature

i personally would use a 2 stage programmable. see if you can find one with smart recovery
Old 05-11-04, 07:59 PM
Jay11J's Avatar
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Location: Rochester, Minnesota
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I am w/ HVAC. You should get a 2-stage t-stat... YOu'll get your money worth from it. Otherwise, You not really getting what you paid for by using a 1-stage t-stat.

When heat calls on the single stage, the furnace may run on low flame for about 15 min, then kick into high flame.. It may lead to "short cycling". Spend a few extra bucks for the 2-stage stat.
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