Comfort First Heating & Cooling came out to repair my coolant unit when it went out, their service was covered by the warranty. It took 3 days for them to come out, and the repair itself took less than half an hour. It's working fine now, I'm happy with it. The one thing I'll say is that Comfort First wasn't able to come sooner because during the summer months a lot of companies don't work on weekends, and I think they should have emergency units available on weekends for when things go wrong. Apart from that I would recommend them, they did a good job.