I know this has been asked many times before, but I don't have time to find it. Can anyone recommend someone to check my HVAC system who is both good and likely to show up quickly (not likely to rip me off would be a nice bonus). The A/C worked fine a couple weeks ago, but I tried to switch to heat this weekend and got nothing. It may be something simple, but I couldn't figure it out and my 82-year old mother is visiting and freezing!