One of the most important appliances your home needs to run properly is the HVAC system – without it, you’d either be freezing cold or sweating bullets all day, depending on the time of year. It’s key to making sure the temperature remains in a comfortable range, and when something goes wrong with it, the effects your household feels are intense and unpleasant. Should something go awry, that means you’ll have to come up with a boatload of money to pay for it, and that’s not something anyone ever wants to have sprung upon them.