I need some of your thoughts. I’ve been reading what people having been writing and trying to figure out if my situation matches.
I have a 725 square foot brick and concrete block house on a cement slab in Southwest Lower Michigan, a mile from Lake Michigan. The duct work runs overhead with a centrally located return. I use the house as a second home all year long.
In March I had the furnace replaced with a Lennox G60OUHV-36A-070 and XC13-018-230 A/C added.
The company said they would come out and check the A/C on the first hot day to make sure there was enough of refrigerant in the unit. The tech that helped with the install added some gas and lower the fan speed to one from the factory setting of four. After two hours of running no condensation came out of the drain tube. The house could be cooled to 71 degrees with six adults, but too much humidity. I called for service.
The supervisor tech came out said it was over charged and fan speed too low, after he checked temperatures in the ducts before and after coil and the gas in A/C. The same thing happened again.
So I raised the fan speed to three. Now water always runs out of the condensation tube. When the tech called me and asked how things were working after his changes, I told him what I did. He said sometimes, you must do that in your situation. The house feels better now.
What does that mean, my situation? Is the house too small for central A/C? Too much concrete? 4 inch duct was changed to 6 inch flex duct, but the opening in the ceiling stayed the same.
I had a 14,000 Btu window unit that did fine after a day of running. On the third day humidity would drop to 45% in the living room. Now it won’t go lower than 60%. They wanted to sell me a 2 ton unit, I insisted on the 18,000 Btu’s because 14,000 did the job. I know that A/C must run in order to remove humidity and I said that to the salesman.
I have the Honeywell t-stat that you can call and check inside and outside temperatures. It’s a great t-state for second home owners. Most of the time the house didn’t get above 80 degrees, with shades down. I have lots of trees on the West side of the house. I give the house at least 12 hours of cooling before arriving.
Last question, what was the reasoning behind letting the fan run at 50% for 30 seconds after the A/C shut off? Default setting.