About a month ago our old furnace had to be replaced and we went with a high efficiency one. We did this having been told that our gas bill will go down a little bit because the natural gas isn't wasted through the chimney as much as it is in the older, less efficient furnaces.
Well, we had it put in and that very first evening we noticed that the temperature of the bedrooms tucked in the northeast and southeast corners of the house were downright cold, even at the temperature we were normally used to keeping the thermostat at. I called the utility office the next day and told them of our situation and they had somebody come out and take a look at the furnace. I had a few concerns - was the furnace actually big enough for the house? and was it hooked up properly so as to get the heat we were supposed to?
This is what I was told - high-efficiency furnaces blow hot air out through the vents at a slightly lower temperature than the older furnaces do (about 120° compared to 150° with the old ones) so the moving air can and will feel more chilly than that of the older furnaces. Plus, these newer furnaces have digital thermostats which are much more accurate and will keep the temperature setting within a couple of tenths of a degree, thus running more times throughout the day in shorter spurts. Basically, the guy told us that even though we may need to keep the thermostat a little higher than we're used to to feel comfortable we will not be spending more money on our gas bill because the fuel is used much more efficiently and not wasted, so we've been keeping the house an average of 3 or 4 degrees higher than we're used to.
And, still, even after setting it at 72° at night (we do this because our 1-year-olds tend to kick the covers off of them and we don't want them to get cold) it gets chilly in the corner bedrooms of the house. The living room, dining room and kitchen (located more in the middle of the house) are all comfy for the most part.
Was this utility guy being straight up or was he pulling our chain? To be honest, even though the numbers are high I feel some days we should keep the overnight temperature set even higher than 72° because of our kids ending up with no covers. That just doesn't seem right to me, though. Can the fact that the fluid gases (I think that's what he referred to them as) burn and come up through the vents at a lower temperature really cool the air off in here that much? I'm really wondering if getting this high-efficiency furnance was our best option and if we should have it changed out to an 80% efficient furnace.
Ugh! The joys of house upkeep!