An HVAC tune up is more than a quick look. Here is what a real maintenance visit includes and why it pays for itself over a season.

Replacing your AC and furnace together is not always necessary, but often makes sense. Here is when pairing them pays off and when it does not.

An HVAC zoning system uses dampers and multiple thermostats to fix uneven temperatures between floors. Here is how zoning works and who needs it.

Spring cooling and fall heating service keeps your HVAC reliable and efficient. Here is what seasonal maintenance includes and why it pays off.

A finished basement needs more than the existing system can give. Here are the options for heating and cooling it comfortably, from a zone to a mini split.

SEER and SEER2 ratings measure how efficiently your AC or heat pump runs. Here is what the numbers mean and how to choose the right efficiency.

The refrigerant in new AC systems is changing. Here is what the phaseout of the older refrigerant means if you are repairing or replacing your system.

Your AC is running but the air is warm. Here are the common reasons an air conditioner blows warm air and what it takes to get cold air back.

Water around your indoor AC unit is a warning, not a quirk. Here is what causes an AC to leak water, what to do now, and how to stop the damage.