R410 Vs R22 humidity removal
In June 2012, I replaced my 10 yr old compressor and handler and always seem to be sweating in my house since the change. I've had the new AC contractor come out 3 times since the install and I just don't understand why I "feel" so hot when all the temp settings are the same as with the old unit. The first two visits, they said the R410 needed to be topped off a little and the 3rd time, they said all refrigerant levels and pressures were right to specs. This is driving me crazy 'cuz I live in FL and even when wearing shorts and a tank top in my house, I'm wiping sweat from my forehead regularly. I keep my 3 zones in the 75-77 range, as I did with my last system. My thermostat reads that the temps are right on, but it just feels like it's not pulling anywhere near the humidity out of the air as the old system did. Here are some specifics:
Old unit: Carrier 5 Ton, 10 SEER, R22, 3-zone, variable speed handler
New unit: Amana 5 Ton, 15 SEER, R410, 3-zone, variable speed handler
Other possibly pertinent info: The unit I replaced is for my downstairs area, which is about 80% of my total living area. I also have a 2 1/2 Ton Carrier system for my upstairs and the downstairs and upstairs handlers sit side by side. The new AC contractor looked at all my duct work for downstairs and said that my downstairs handler wasn't getting enough air supply and he recommended increasing the air flow. He did this by cutting a hole between the supply cavities between the two handlers.
What I'm wondering, though, is if the new 5 Ton unit is now pulling too much air from the supply ducts that used to be just supplying the 2 1/2 Ton upstairs unit, I've definitely noticed that it's a lot more comfortable upstairs since the change, but way less comfortable downstairs. I'm no AC expert, but I'm a pretty intuitive DIY guy and I think this may be the root cause of my humidity issue.
The new AC contractor told me these two things: 1) While the industry officially says they're the same, contractors know that R410 systems pull less humidity out of the air than R22 systems; and 2) Just crank the air down an extra 4-5 degrees occasionally to pull out the humidity, then put it back to my normal comfort area. Any thoughts on how to improve my humidity situation?