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Any thought on my issue will be appreciated.

Before getting new tenants into my house, I discovered that although I have duct work, there was no aid conditioning. Since this was during the heat wave in July, it was super difficult to find someone and when I found someone willing to install it asap, I was very grateful but I realize now I made a mistake by not drawing a contract.

So now after virtually 2 months, the newly installed central air unit stopped working as it got frozen. The pipe connecting to the unit just froze. When I called the guy who installed it, he told me to thaw it off and dry it by turning off air conditioning and turning fan and then put it on 75 and it will work. I did that and it worked.

My questions are: why this happened in the first place, can I put it below 75 and how I can prevent this from happening again?. The contractor is not responding to my calls and I don’t how what to do.

Any advice will be appreciated.

Thank you.