We first called Quality Refrigeration Services about 15 years ago to replace an air filter. We have been using their services ever since. Over the years, they have replaced both the furnace, and air conditioning units. Howard, he does the air conditioner, and Patrick, who does the furnace, are both great. They do excellent work. They come out during the year and do the maintenance on the units. I would absolutely recommend them. They are always prompt, professional, and keep the area clean.