Surge Protection, not just for your home electronics! Most HVAC systems in the home, average cost, somewhere between $10,000 to $15,000 and when hit with a surge they do anywhere between $900 to $7000 in damage. in Public bookmarkswith do_it_yourself_hvac Note: Most HVAC systems in the home, average cost, somewhere between $10,000 to $15,000 and when hit with a surge they do anywhere between $900 to $7000 in damage.