At your rates your AC running steady, night and day may cost you over $600 a
month to run it! My guess is you AC may need a tune up, or even replacement.
4 tons in a 2000 sq/ft home seems to me a bit large, but there are many
variables so it is a WAG. Your unit is probably 6 or 8 SEER, the new units
can get to 14 SEER pretty easy. A new will cut your cooling costs
considerably as long as it is the problem! I think raising the 'stat to
about 75 degrees will help too. You also state you have a humidifier
running, that makes me wonder if your AC is working properly. If your AC is
running constantly the humidity should be 40-50% easily.
The steps I would take first is to tune up the AC, tighten up the home,
(make sure all the windows are closed and tight, etc.) raise the 'stat to
75. and learn to live with the higher setting. Pull the shades/curtains in
south facing windows.
If you decide to replace the AC make sure you get a Manual J done or you are
just tossing good money away!
Wow, something is really wrong there...
I am no expert but a few things jump out at me...
1. A 22 year old AC is very inefficient and gets worse as
it gets older.
2. 4 tons in a 2000 sq ft house sounds like too big a unit
was installed. 2 tons might be better.
3. your running a dehumidifier, your AC should be able to
take out the humidity to a reasonable level.
4. In the NE you have some of the highest electric rates around.
5. 70 degrees is way to low to set that thermostat.
I have a 1 ton Trane unit about 6 years old on my 1200 sf ranch
in Atlanta but I have about 1 foot of batt insulation in the attic
and maintain a constant 79 temp day and night...I also have
several ceiling fans turned on low speed most of the time too...
Last power bill was $45 (the highest this year)...
Have an electrician check out your usage it will be money well spent!
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