When one component of your system breaks down unexpectedly, it's easy to just focus on repairing or replacing that component. But each part of your system works with the others to boost efficiency and reliability, so it helps to keep the big picture in mind.

Replacing your old Air conditioners with a new higher-efficiency model but leaving your old mechanical thermostat in place, for example, won't allow you to enjoy all the efficiency advantages the furnace has to offer. Likewise, if you install a new furnace but don't get a humidifier, the air may seem cooler, forcing you to operate your new system at a higher temperature to be comfortable. Plus, you can often save on installation costs if you have several components of your system (for example, a furnace and air conditioner) replaced at the same time