AC doesn't seem to cool like it should

[Sdexte]

Hello, 2019 Montana HC 373RD with Dometic Brisk Air II w/heat pump, 15,000BTU. Was working great until we had a recent roof replacement and they removed and replaced the unit. Now it does not seem to cool the living room and kitchen down like it used to. The outside temps are running in the low to mid 90's and the best we seem to be able to get the inside temp down to is 80 degrees ( I have the thermostat set at 65 degrees). I removed the round louvered AC vent covers and there is a strong air flow coming out. I'm trying to think of what they could have done to the unit, or something that they should have done but didn't, that would have made the difference between then and now. We have been in very warm weather in the past and it kept it very cool.
The bedroom AC unit, which was also removed and replaced, seems to be working correctly and keeps the bedroom nice and cool. Any suggestions before I call a tech would be appreciated.