During a cold winter day, the last thing you need in your home is a second air conditioner. So if your furnace suddenly starts blowing cool air, it is definitely a cause for concern and something you’ll want to have changed immediately.
There are a number of reasons a furnace might blow out cool air. We have outlined several of them below. Please don’t try a deeper diagnosis of the problem on your own if the solution isn’t a simple one. Instead, call for professionals.