Q. We have a problem keeping several rooms comfortable. These rooms are either chilly during winter or hot during summer. What are some efficient methods to balance out the temperatures in our home? A ...

What do we look for in a spring air conditioner tune-up, and what is the most expensive problem AC systems can have? -- D.R.P., Tulsa. Duct, why a duct? A big concern with older air-conditioning ...

Duct-free mini-split models are available in 9,000, 12,000, 18,000, and 24,000 Btu, and come in ratings to 20 SEER. The 17 and 19 SEER Series are heat pump models and use inverter technology to ...