Purchasing

This add-on to your water heater uses hot air to heat the water in your tank by Chris Ermides

Hot2O solar hot-water system by Roe A. Osborn

Cross-linked polyethylene tubing is cheaper to buy, is faster to install, and won't corrode or explode by Andy Engel

Easy to install, these programmable gizmos can save money and keep you comfortable by Sean Groom

Powerful, quiet exhaust fans and their smart switches have made it easy to avoid mold, mildew, and stale air in the bath by Scott Gibson

Whether it's new or a replacement, a properly sized and installed system affords greater savings and comfort by Chris Green

by Peter L. Pfeiffer

All you need to know to pick the right kind, not the right brand by Scott Gibson

There are lots of options for taking the chill off. Which one fits your house? by David Ericson

You don't want the noise and dust associated with furnaces; you want the comfort of radiant heat. Here are some options for heating the water and getting it to your floors. by John Siegenthaler

Pick a fan that's quiet and powerful, and keep the duct short by Rex Cauldwell

The kind of ducts you use and the number and types of turns they make dramatically affect HVAC-system performance by John O'Connell, Bruce Harley

You'll save money and stay more comfortable by matching the heating system to your climate, your house and your needs by Alex Wilson