I've had nothing but good experiences with them.
We're very happy with Allied Services, and they always do a really good job. First of all, they were the people who installed the original furnace when we originally built the house ten years ago. Everything was great, and a few years back, we switched from electric to gas after we finally got a permit to do so. They installed a gas heater then, and they did a good job. The furnace is still working today the way it was when they first put it in.
They come out twice a year to check the furnace and the air conditioning unit, and everything has been working perfectly. The workers are neat, polite, and they never make a mess. They're always on time and great to work with. I've never had a problem with them, and everything they told me is still right on.