What's Hot Pat announces his choice for "Furnace of 2016" Da Bomb Pat shares some tips on how not to blow yourself away this bar-b-q season Technical Stuff Add some "bling" to your home comfort system with hi-performance parts. Have a gas problem? If it_s not a digestive issue __ When Should You Replace ? Typically, it_s best to replace your furnace or when the cost to repair it approaches 30% of the total value of your heating or cooling system. And, depending on the age of your current system, new equipment can be 50% more efficient. With new equipment, the utility savings start paying you back immediately. Plus, you may avoid costly repair bills in the years ahead. How Does Replacing a System