The upper floor of my house has a split A/C,
three-ton. When the temperature gets up above about
95 Fahrenheit, the unit can't keep the upstairs cool. That means that for a few weeks a year, my kids' bedrooms are still almost
80 F when it's time to put them to bed. That's not really acceptable. Multiple technicians say there's nothing wrong with the unit. I understand that A/C units are sized to keep you comfortable 99% of the year, so it looks like I'm just struggling with that 1%.
My attic has an approximate
R value of 32. Not super, but the calculators I've seen indicate that upgrading to 49 won't pay for itself in less than twenty years. So I don't think insulation is the main issue.
The house is about eleven years old, so I expect the compressor to require replacement any minute.
- I could upgrade to a larger unit, but then you run into short-cycling issues.
What if I got a larger unit with a two-stage compressor?
For example, I could get
Goodman GSX14 three-tonas a direct replacement.
or I could also get a
Would the ability to run at half-speed compensate for the short-cycling concerns, and allow me to have a higher peak rating without the downside of lost dehumidification?
- An alternate solution would be to get some portable 12,000 BTU units and just use those during the peak temperatures.
I'm not sure if that might have other side-effects.