I've used Ace Hi for several years, both for regular maintenance on furnace and A/C, and for repairs. Michael is always professional, detailed, accurate, and he explains everything he does - and doesn't do because it is not necessary. I trust him and the company. I have called for advice on things, and always got good info, not just how they can "sell" more. Their approach to business and customer care makes for a long-term relationship. I recommend them without hesitation.