This Old House plumbing and heating expert Richard Trethewey explains the extreme importance of maintaining your water heater s temperature-and-pressure relief valve. SUBSCRIBE to This Old...

Plumbing and heating expert Richard Trethewey shows how to prevent ice buildup from shutting down an air-conditioning system. (See below for steps.) SUBSCRIBE to This Old House: http://bit.ly/Subs...

Landscape contractor Roger Cook helps a homeowner install a water-saving drip-irrigation system. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/Subscr...

Host Kevin O Connor explains the differences between three popular masonry materials. (See steps below.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Steps for Understanding...

Plumbing and heating expert Richard Trethewey makes heating water more efficient by installing a heat pump. (See below for steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse...

Scott Caron, master electrician for Ask This Old House, wires an old house with new smoke and carbon monoxide detectors. #ThisOldHouse #AskTOH SUBSCRIBE to This Old House: http://bit.ly/Subscribe...

Ask This Old House general contractor Tom Silva shows how to permanently patch a decaying porch post. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/...

Ask This Old House plumbing and heating expert Richard Trethewey shows an efficient, low-maintenance way to humidify the air. (See steps below.) SUBSCRIBE to This Old House: http://bit.ly/Subscrib...

Ask This Old House general contractor Tom Silva helps a homeowner install an emergency escape ladder. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/S...

We re kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contractin...

Now that we’ve finished our tour of the planets, we’re headed back to the asteroid belt. Asteroids are chunks of rock, metal, or both that were once part of smallish planets but were destroyed...

Today on Crash Course Astronomy, Phil explains comets. Comets are chunks of ice and rock that orbit the Sun. When they get near the Sun the ice turns into gas, forming the long tail, and also...

Ask This Old House general contractor Tom Silva shows how to cut and fold, and then fix, a rigid box spring. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House:...

Ask This Old House general contractor Tom Silva demonstrates the amazing versatility of the humble rafter square. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping...

Ask This Old House landscape contractor Roger Cook creates a water-efficient waffle garden. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeTh...

Roger Cook discusses foolproof tips and techniques for starting plants from seeds. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHous...

Richard Trethewey shows an innovative new way to seal ducts from the inside. (See below for steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Richard uses a new technology...

Kevin O Connor helps a homeowner install a wireless alarm system. (See below for the shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping...

Richard Trethewey helps a homeowner install a new sill cock. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Richard replaces...

Richard Trethewey helps a homeowner silence a shrieking shower. (See below for shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Cost: $5...