Your air and heating unit is essential to your comfort at home. It also serves the purpose of keeping moisture to a minimum and filtering out dust and dander from the air. And considering that it can easily cost several thousand dollars replace, it makes sense to spend some time and money keeping it up and running. Here are ideas on how to do that safely and effectively. Gather Your Tools When it comes time to tinker with your heater, you need a few tools. Some of them won’t