Electric cost...2T unit vs 3T unit
Well, I have had my new Trane 3T system for the summer now. It replaced a 2.5T, 20 year old unit in the home we have been in for 3 years. That old unit was doing an OK job cooling but for whatever reason, it was having trouble keep the home warm in the winter. There were some discrepancies over staying with a 2.5T unit or going to a 3T unit. Most of my quotes recommended going to a 3T. The one guy who I know did some sort of calc said a 2.5T was borderline. Since we had been having issues keeping the home warm in the winter already and we wanted to drop a couple of ducts to the basement (its being slowly finished and we have hopes it will take the cold edge off) we opted for the 3T system. As far as cooling, the 20 year old unit kept the house fairly except for our bedroom over the garage.
I am happy to report, perhaps due to the 3T unit and some sort of things they put in my main duct line to push more air upstairs....that our house, in general, feels great and the temp difference is not very much going from room to room. Our bedroom is much better too. In fact if we leave the vsb fan set to: ON...our bedroom feels as good as they rest of the home, surprisingly without a nasty draft. I do notice with that blower left in the: ON position, the house humidity appears to rise. Shut it off and it lowers. With the fan: OFF, we find on some cooler nights the bedroom gets stuffy so we end up dropping the temp a degree or so.
All this being said we are happy EXCEPT I have realized no electric savings. My dad is on a budget with the electric company. He got his unit the same time as us and they already lowered his budget. My bills are essentially unchanged which really means this unit is costing me more since the weather has been cooler this year.
I have the rep coming out to discuss this, the humidity issue and the fact that a 15KW heat kit was to be installed and only a 10KW was. I do not want to get adversarial with him over the heating / cooling bill but I did expect it to go down. I now fear my winter bill will actually go up...though perhaps the home will actually be warm for a change.
Was I foolish to expect to save maybe 25% or so on my cooling costs? Is there anything technical I should call into question?
Maybe a programmable stat is they way to go. We pretty much left the stat set at 73/74 and the fan on: ON all summer.
What do you think? Its a 2200 sq ft two storyÂ.