Hello! We have a 2300 sq ft modular home. We had a 4-ton unit installed in May of last year. Where we live in the SE US, it commonly gets up to 100, occasionally up to 110 degrees in summer. Our air conditioner was running from around 11am until 6pm without stopping, with the air in the house getting to 77 degrees on an 89 degree day. The people who installed the unit checked it about a dozen times, couldn't find any problem, so told us we needed a 5-ton, 15 seer unit. This was installed about a month ago. We have had a VERY mild summer this year, but the air inside is still getting to 77 on a 90 degree day. We keep the curtains closed and have some shade on our home in the mornings.
Under the house, there appears to be about 30' of 14" flex pipe just pretzelled around (out of a total of about 50' under the house), twisting and turning under other pipes. We have mentioned this to the installers but they won't even look at it and insist they can't find a problem. It seems to me having to push the air through all this excess pipe through all the extra twists and turns is only making it work harder, but I don't claim to know a darn thing about air conditioning systems or ductwork! Could too much pipe cause this type of problem?
We have a 14" supply and 14" return going to the package unit. We have two returns with 14" flex pipe, tied together to a 14" flex, then it goes to the unit. My electric bill runs around $400 a month in summer and our lowest bill was in October at $159. The summer bills kill me
Any advice is much appreciated!!