Maybe they put in an A/C and wired it as a heat pump. This would bring on the A/C when they want heat. Then they turn it up to 78, and the electric heat stages come on, and they finally get heat. It would use a ton of electricity since the A/C would be cooling while the resistance heat is heating. Leaving it set at a certian temp would cause the A/C unit to never turn off, with the resistance heat cycling at a temp lower than the thermostat setting.
If a strip heat with A/C was installed I would think the bill would jump, as all the ones I've seen pull 20 amps at 208/ 230, per strip. A retirement place I did some work at had Air handlers with 3 strips in each unit. So in heat it could pull 65 amps, cooling maybe 20.
Si, and if that 78 degree temp is anywhere near the house temp it is easy to understand the increase.
Originally Posted by 4l530
When you get home check to see if the outdoor unit is running when the heat is running in your home.
Heat Pump model would start with 25H,cooling only 24A .
The 24APA5 Performance model is an air conditioning condenser.
The 25HPA5 Performance model is a heat pump condenser.
It appears someone has made a terrible mistake.
see attached link
What was replaced with your new system? Just the outdoor unit, or both the outdoor and indoor sections? Was any ductwork replaced or altered between your old system and new?
Also, did you ask for a heat pump when purchasing this system?
There is a great deal of poor speculation going on. First there are very few heat pumps in Houston and the few that are around are on homes with gas heat go figure.
Most around here that size by square foot will use 400 sq.ft. per ton not higher.
If she had a 2.5-ton unit originally it would have had a 10 KW strip and maybe a 60 amp breaker more than likely just a 50 amp. If they then installed a 3.5-ton system it would have a 15 or 20 KW heat strip. It is very unlikely that the installing contractor would have upgraded the electrical panel to match.
We need much more information to determine what is going on here.
Tamayra look in my profile click on my website and call my number and I will assist you. It is likely that I know your contractor and can help you get this resolved.
I've seen it before. the supply air temp would be much lower and the electric bill would be through the roof.
Originally Posted by dash
OP said "We are having to run the heat at 78 to get it warm. It is either to hot or to cold, it is never comfortable." sounds like both are on to me too.
Lol, ain't that the truth. Sorry about that, chief.
Originally posted by classical
There is a great deal of poor speculation going on.
This space for rent.
[quote=classical;1776674] Most around here that size by square foot will use 400 sq.ft. per ton not higher.
400 sq. ft. per ton?????????????????????
I've never heard that before. That would be a 4 ton unit for a 1600 sq. ft. house. Seems grossly oversized to me. I live in a 2500 sq. ft. house and I have a 3.5 ton unit.
But then again I don't live in Houston.
Yep 400 sq.ft. per ton is the norm here, some older homes actually need 1-ton per 300 sq.ft. some newer homes require around 1100 sq.ft. per ton.
Originally Posted by classical
One of the main reasons that the tonnage was determined to be in that range was in the early days they were so poorly installed that that is what it took. RNC homes are still installed very poorly here in fact to a great extent even worse in the 70's. If you determine the actual functioning capacity of a system it is generally only producing about 60% to 70% of rated capacity. In the early 70's the ductwork was snap lock and had low static. The return was grossly inadequate and coupled with poor insulation in the attic and walls, over sizing was very common just to meet the needs of the house with an underperforming system.
As flex duct became more prevalent supply side static increased further reducing system capacity and this problem still exist except with load calculations being required on RNC the system are now effectively undersized.
300 sq. ft. per ton? Don't that beat all! I remember helping size and area in Myrtle Beach, SC. It was under a motel built on pilings. They wanted air conditioning there so we provided it for a Veterinarian Conference. It was basicly outside with curtains. We sized it 300 Sq. ft. per ton.
Outside with curtains would be a fair discription of some of the older homes around here. Homes built in the 20's thru 50's with no insulation in the walls original wood frame windows leak like sieve. A 900 sq.ft. bungalow needs a 3-ton best installed with a variable speed motor or more likely a 2-ton coil for humidity control.