RGS are the best HVAC specialists............BAR NONE!!!!!!! Shortly after installation of my A/C unit (not by RGS) many years ago, it failed miserably. Many so called HVAC specialists fixed it, or so they thought, only to have it fail again. The last expert said the entire unit was shot, and had to be replaced. That's when RGS became involved. Roozbeh fixed the unit within short order, and I have had many years of trouble free service ever since. I have recommended RGS to many friends and all have had excellent experiences. Roozbeh is very knowledgeable, very professional, and completely honest. I have him do the annual service on my furnace every year now.