Wow, you sound like you had the same experience I did in my old home. Contractor used a 2-ton when a 1.5 ton would have worked just fine (and based on the 2-ton's 50% duty cycle at 95 degrees, I'd bet even a 1-ton would have worked. It seems crazy to try to cool 1400 sq feet with that, but it's a townhouse with a load only on 40% of the exterior wall space).
Originally posted by 54regcab
The unit is in fact oversized by about 50%. I can't justify replacing a working system when a $5.00 timer does a decent job at controlling the humidity (I already had the 24V DPDT relay on hand). I looked into dehumidistats but I have yet to see a standalone digital model or one integrated with a thermostat at a reasonable cost (the analog ones just aren't accurate IMHO)
When the existing equiptment (2000 model) wears out we will be getting a 2 ton instead of a 3, and a 40K BTU furnace instead of an 88K. Until then we'll just pay the increased utility costs. I really do wish more HVAC contractors would use HVAC-CALC instead of using "rules of dumb" to size equiptment. As a HO I would have no problem paying the same price for the smaller equiptment knowing that the contractor took the time to size it correctly.
IMHO Chances are also good if a contractor went through the trouble to engineer the system correctly, it will most like be installed to actually get the rated efficiency :D