Originally Posted by kok328
I've heard that programmable t-stats actually will cost you more money by having to re-heat the home after being lowered during the 'away' periods. All the walls, floors, ceilings and furniture in the home will have to be brought back to temp. This is similar to setting your offset to a couple of degrees to prevent short cycling. I hope the pros chime in or someone with time on their hands to search for supporting or contradicting information helps us out here.
I used to hear that about costing more to re-heat or re-cool and that it is more efficient to set it and leave it, but from what I have read in the last few years, that is a theory that has been put to rest.
I've noticed something this evening. It was in the upper 50s when i came home this evening and my heat had been off today. It was 67 degrees in the house. It has rained all day and there was a chill in the air, so I decided to turn the heat on to get rid of the chill. I have it on 70 at a 3 degree span.
I turned it on, it ran for a few minutes and heated to a low 72. It's been over an hour, and the temp is at 70 and the unit has not yet come back on; however, if it were on the 1 degree span, it would have cycled a few times.
So, I guess there are times when the longer span is better.