Originally Posted by sailor86
We've got a fairly old A/c unit in our mobile home. Got it serviced at the beginning of the summer. Learned we can't set it at 74 and expect the coils not to freeze up. The unit worked great all Texas summer long. Even through the 20+ days of triple-digit heat. Usually had it set at 78. Now, the weather has cooled down, mid-70s, lower 80s. But now it has started freezing up again. . We change the filters about every 2 months, even though we keep a clean house and no smoking inside. What could be the culprit?
When it was hotter the air going through the coil was 78 degrees so the coil would not freeze. There are points in the coil that get real close to the freeze
point. so if the air is slowed down in any way it can freeze the water that is running down the coil. If the home get a lot of humidity in it then you have more
water going down the coil and that slows the air flow down a little, and your are now running cooler air , so it freezes. You can take all the numbers off the furnace and blower and take this info to a furnace wholesale house and they can tell you if you have the right blower for the size of your air con..
another you should thats get over looked a lot is, take your blower out and see if the curved fins are getting a lot of dirt build up in them. That can really slow the air flow down. Check to see if you are using the black hi speed wire
when in the air con mode.. Later Paul