2 stage t-stat vs. constant temp.


Old 02-22-07, 08:25 PM
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2 stage t-stat vs. constant temp.

I have a Trane 2 stage variable speed high eff furnace I just installed. I ran extra t-stat wires thinking I would put on a 2 stage t-stat vs jumpering w1 + w2 as I have done temperarily. Low fire I think runs 10 min before high fire kicks in. I asked my boss for a 2 stage t-stat, at which point he told me it was pointless. He said that if I maintain a constant temperature in the house and don't fluctuate up and down as I leave for work etc., that the furnace will only use low fire to maintain this temp. However, with 2 stage t-stat, temperature swings cause high fire to be used more frequently and thus, as much, if not more gas. I know not to set the temp swing more than 3 degrees. My question is this.... Should I leave the single stage t-stat and eliminate my progammed temperature shifts or Should I spend $100 for a 2 stage t-stat and utilize the programmable option? If so, which thermostat is recommended?
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Old 02-22-07, 08:54 PM
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What makes the unit more effecent is that it is a two stage.
The way it works is this when the system is first turned on then both stages run, then when the T-Stat is about 3 degrees before being satisfied then the secnond stage shuts down and only the first stage is running.
If it is a set back T-Stat then remember that setting it more the 6 degrees from the set point it will cost more to catch up.

The whole point of a 2 stage furnace is to use both stages. That is where the savings come in.
Old 02-23-07, 09:48 AM
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Get a two stage t-stat on that nice two stage furnace that you paid for.

Two stage provides COMFORT! You paid good money for that furnace, and you should get the comfort as it should begiving you on a two stage t-stat.

I know my parents had a single stage first time around on the house, and house comfort was ok.. Lower family room was cold since the furnace cycled on and off.

I put in a two stage VisionPro and mom said BIG improvement in the temps all over the house, and the family room is comfortable.

You are not going to use any more gas when it runs steady on 1st stage.

When we had our cold snap in first part of Feb. (Lows -10 to -20) my furnace ran steady keeping the house nice and warm all over, and cycled into 2nd stage as needed.

I'd type more. but I gotta go! I'll write more if you have qeustion later on tonight.
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