O.K. Experts--- So, far 2 contractors have come out to my Tidewater VA 2280 square foot home currently cooled by a 30 year old Kenmore 3 ton unit. I am replacing it before it dies as the wrong time, and will probably replace the ducting also. Both gave me the Rule of Thumb (which is also used by Virginia Power),
1 ton/600 sq. ft., therefore 4 ton unit should be installed. One did a Manual J and came up with the same size. He doesn't understand why and is coming back out with his boss and his laptop on Monday. Now, the Sears runs much (but not all) of the time at an ambient air temp of 90+ but does cool. the house to the 75 degrees it is set for and keeps the inside humidity at a good level. I have been told in the past (and don't know the basis for that either) that a unit "works better" when running much of the time All y'all have have constantly said---Don't get a unit that is too big, it is worse than too small and among other things will not properly dehumidify the house. So, is a 1970's 3 ton unit, bigger than a 2004 3 ton unit (both specify 36K BTU). Why the difference. I could see maybe going with a 3 1/2 ton unit max---but I feel I'm on shaky ground even doing that. Help please! I would be like to be able to hold an intelligent discussion with these gents on Monday- posted
19 years ago