Thanks for the ideas . The old unit was a 3 ton w/80,000 furnace and still had the same problems to an extent because I had to replace the bottom half of the plenum.I figured that if I insulated the plenum and trunk line it would stop it. (plenum is insulated with 1/2" blue board.) The heat loss\gain was calculated 3 ton but wouldn't cool the house when temps reached 90+. I wouldn't think that 1/2 ton would make this much difference, the first 15 to 20 feet look like they have been sprayed with a garden hose. there is actually some spots that are starting to puddle on the ground. I have put down new 4 mil. plastic on the ground, also ran an extra blower under the house to try to dry it out. There has to be an answer-I just can't find it. I was just wondering if anyone else has had any problem with the new R410 causing problems because of the lower temps? I also checked and drain is fine.