AboutHoward Livingston Expertise Can answer questions on electrical control circuits, power supply,airflow & distribution, electrical components,refrigerant problems,gas, electric & propane furnaces.No boiler or refrigerator or oil fired furnaces experience.Just HVAC questions please.
Experience 35 years experience in residential & light commercial repair & installation.
Question Thanks for your help!! We have a Coleman blend air system - 4 ton in a 1782 sq ft mobile home built in 1996. Over the years the A/C has not cooled the house quite as good as the previous year. Yesterday it was 86/87 in the house but coming out of the vents at 69/70. We had someone check the unit twice in the past month and they cannot find anything wrong with the a/c itself, they say it is doing all it can. We live in GA. If you stand in the living room (largest room) and reach toward the ceiling you can feel the heat coming off the ceiling. Last year we had to have a large window unit in the living room, a small one in the kitchen and the central unit running to keep the house cool - the electric bill was over 400.00 a month. I just looked up a manual online and it says some blend air units have a fan in the ceiling. If mine does i dont know where or where to look for it and that would make sense to me if the fan quit that the ceiling would be so hot. Any ideas on anything?
Answer That phrase "it's doing all it can" is familiar. I've used it myself so I would accept that it is full of freon & everything running. The 70 deg air is good. So I would turn to air distribution as the problem. Double wide homes have a duct crossover to distribute air to 1/2 of the house.Usuallyflex duct too. So I would examine that & the return/supply air duct for quality & holes. Maybe the floor ducting has collapsed. Have you noticed a decrease in air flow as the cooling diminished ?? Changed the air filters ??? Examine the evaporator coil upflow side for dirt on the fins. Does your model have attic space ?? Have lots of insulation in it ?? Heat load hasn't changed so I'd still bank on air flow. Check it out good.
