moisture barrier

[Sandy]

We purchased a pre-owned 1977 Mobility manufactured home in 2001in Zellwood Station, Florida, which is about 20 miles northwest of Orlando, FL.
Knowing nothing about manufactured homes, when we read the inspection report, we overlooked the fact that the moisture barrier under the home was in need of replacement.
Well, 5 holes in the floor later, we were finally told that the "moisture barrier" needed replacing.
Now, to the problem, I am in my 60s and my husband is in his 80s, so this job is beyond us.
I'm not sure you can help us with this, but here goes. How much should a job like this cost? It is a double-wide trailer sitting on a stone and mortar foundation. The air-conditioning ducts run under the house.
I had the house checked for termites and then for plumbing problems. Each man went under the house at different times to check why we were getting holes. Each said that the air conditioning ducts are throwing moisture up on the floor (which of course is pressed wood) and making it rot. The ducts were replaced in 1994, according to paperwork that came with the house.Does this part of the home just go bad or did something have to be done to it to make it go bad?
I contacted the air conditioning company that replaced the system and was told that this is impossible. If the ducts were "sweating" the water would drop down, not be thrown up. Guess that's right. I don't know.
Our home was financed by a bank in 2001, so we didn't think it was too old to buy.
How do I find someone in our area to replace the "moisture barrier"? Regular construction companies want nothing to do with it. I did find that pest control people supposedly put down moisture barriers, but I'm told they just lay it on the ground rather that tacking it to the under floor. Is this the way to go?
I hope this question is not too long and worth your time to read and answer it. If so, I thank you very much in advance.

[rmurray]

A moisture barrier should be on the ground under the home...If Zellwood is still selling any new homes...ask them for a referal to a set up crew...If they are sold out...try going to another local dealer and ask for a referal to a set up crew...this is something that can be done in an afternoon...Should not cost much more than $200 to $300...

There are thousnads of homes in your area...there should be other manufactured home service persons as well..

Good Luck..

[trmimo]

Laying the moisture barrier on the ground is just fine. You want to stop ground water from evaporating under your home. What the a/c people forgot about is that dripping condensation evaporates and is absorbed by your house. I would suggest having the a/c ducts replaced at the same time. Contractors may be hard to find in your area right now. You may have to wait a while for them to get to you.