Simply put, winters in Dumfries can be cold, and summers can be hot. Your home’s HVAC system may not be up to the challenge. And as a result, it may be working harder than usual, especially when the temperature outside dips below or rises above the average for our local area. When that happens, it’s only natural to hit the thermostat with an expectation of the heating and cooling kicking on effortlessly. But what do you do when you change the temperature setting, and nothing happens, except a higher energy bill?