AC in attic has frost on ins pipe

Old 04-24-05, 05:12 AM
Eddie Steele
Visiting Guest
Posts: n/a
AC in attic has frost on ins pipe

My AC unit in attic for cooling upstairs was not cooling very effeciently...I changed the filter and the next day it had frost on the insulated pipe that leaves the attic and goes to the outdoor unit...what's causing this...
unit has been turned off
Old 04-24-05, 06:09 AM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 17,505
Upvotes: 0
Received 1 Upvote on 1 Post

You can turn just the fan on keep the out side unit off.
First shot is low on freon most of the time .Could be txv valve if you have one . On this Id call a hvac tech now. Dont know how long its been that a tech looked at it but make sure he looks for and fix any leak he finds.

Old 04-24-05, 08:35 AM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,667
Received 39 Upvotes on 37 Posts
Fresh filer

You didn't use one of those pleated filters did you? If you did, pull it out, throw it away, & put in a cheap fiberglass filter. I would bet I get 20-30 calls a year because of those pleated filters. I change the filter to a fiberglass one & the problem goes away. Most pleated filters are too air restrictive & cause lots of problems, both in cooling & heating.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: