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S12 E25: Task Lights, Concrete

Scott Caron replaces outdated fluorescent undercabinet lights with new LED fixtures. Roger and Kevin demonstrate how to work with concrete. Richard teaches Tom about the potential energy savings of thermostat setbacks.

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S12 E11: Crown Molding, Post

Tom installs crown molding. Roger replaces a rotted fence post. Kevin explains the difference between cement, concrete, and mortar. The guys ask "What Is It?"

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S12 E17: Greenhouse, Pendant Light

Roger builds a high tunnel greenhouse with a homeowner. Richard explains the best types of pliers and wrenches. Scott Caron converts three recessed lights into three pendants in a kitchen. The guys ask "What Is It?"

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S12 E26: Kitchen Makeover

Tom and Kevin help a homeowner install new cabinets. Richard shows many options for countertops. Kevin visits the Cleveland home and restaurant kitchens of Chef Michael Symon for ideas and inspiration.

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S12 E24: Accessibility Projects

Kevin helps make a home accessible for a homeowner in a wheelchair by modifying a bathroom and several different sets of stairs. Tom and Kevin rebuild a dangerous staircase for a survivor of the Boston Marathon bombing.

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S12 E23: Table, Stumps, Solar

Tom and Kevin build a simple table from solid fir, and Kevin works with a wood finishing expert to stain and finish it. Roger shows a homeowner how to get rid of tree stumps. And Richard discusses the state of solar energy.

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S12 E22: Special 300th Episode

The guys celebrate 300 episodes of "Ask This Old House" by looking back at some of their best moments and revealing some behind-the-scenes secrets.

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S12 E21: Stem Valve, Dutchman

Richard helps a homeowner replace a shower valve that shuts off mysteriously. Tom shows how to patch a hole in baseboard. Roger shares some tips for maintaining a lawn mower. The guys ask "What Is It?"

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S12 E20: Privacy Screen, Ductwork

Roger helps a homeowner plant a low-cost, low-maintenance privacy screen. Tommy demonstrates many uses for a speed square. Richard uses new technology to seal ductwork from the inside.

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S12 E19: Seeds, Spigot, Island

Roger shows Kevin how to start plants from seed. Richard replaces an outdoor hose spigot with one that will never freeze. Tom builds a moveable kitchen island with Kevin.

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S12 E18: Squealing Shower, Security

Richard helps a homeowner in New Hampshire quiet a squealing shower. Kevin installs a DIY-friendly security system and video camera. The guys ask "What Is It?"

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S12 E16: Fire Ladder, Clawfoot Tub

Richard installs a clawfoot tub with shower. Tom installs a permanent fire escape ladder in a bedroom. Roger shows the best way to prune trees. The guys ask "What Is It?"

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S12 E15: Box Spring, Light Switch

Tom helps a homeowner fit a boxspring mattress up a narrow staircase. Kevin and an electrician repair a light-switch. Richard shows many options for filtering drinking water. The guys ask "What Is It?"

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S12 E14: Post Rot, Dehumidifier

Tom repairs a rotted porch post. Richard visits New Orleans to help a family deal with high indoor humidity. And the guys ask "What Is It?"

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S12 E13: Zoning, Desert Garden

Roger learns about "waffle gardening," a method of growing vegetables in an arid climate. Richard adds motorized zone dampers to a forced-air heating & cooling system. Tom shows an easy way to bisect angles. The guys ask "What Is It?"

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S12 E12: Humidifier, Smoke and Carbon Monoxide

Richard installs a whole-house humidifier. Kevin and electrician Scott Caron install hardwired smoke and carbon monoxide detectors. Tom shows how to remove stripped screws. The guys ask "What Is It?"

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S12 E10: Irrigation, Heat Pump

Roger installs an irrigation system designed to work in a desert climate. Richard installs a new style of heat-pump water heater. Tom shares a viewer tip about re-using an old garden hose reel. The guys ask "What Is It?"

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S12 E9: Routers, Frozen AC

Tom demonstrates many uses for a router. Richard replaces an air conditioning unit that freezes when it runs. And the guys ask "What Is It?"

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S12 E8: Severe Weather Prep

Richard installs a safe room for tornado protection. Tom visits a lab to test different hurricane window protection. Kevin and electrician Scott Caron install a standby generator. Meteorologist Jim Cantore shares insights on how weather is changing and what homeowners can do to prepare.

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S12 E7: Tree, Basement Drain

Roger and a homeowner plant a maple tree. Richard heads to Indianapolis to begin work on a new master bathroom in a basement. And the guys ask What Is It?

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S12 E6: Leaky Skylight, Noisy Toilet

Tommy and Kevin replace a leaky skylight. Richard repairs a noisy toilet. And the guys ask "What Is It?"

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S12 E5: Shade, Hybrid Heater

Kevin explores the Santa Fe style of architecture. He installs a shade sail over a deck to cut down on sun exposure. Roger shows the proper way to use a wheelbarrow. Richard installs a hybrid water heater that saves energy.

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S12 E4: Front Door, Container Garden

Tom helps a homeowner install a new, pre-hung front door. Richard discusses an important water heater safety device. Roger shows how to use big containers for screening and shading in a backyard. The guys ask "What Is It?"

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S12 E3: No Hands Faucet, Drain

Richard replaces a leaking kitchen faucet with a new hands-free model. Kevin explains rechargeable batteries. Roger installs a channel drain in a driveway to divert rainwater. The guys ask "What Is It?"

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S12 E2: Chili Peppers, Flange

Roger builds a garden bed for chile pepper plants in New Mexico. Richard repairs a leaky toilet with a worn out flange. And the guys ask "What Is It?"

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S12 E1: Bulkhead, Recirc Pumps

Kevin teaches the guys how to use Twitter. Tom replaces an old, rusted bulkhead door. Richard discusses several ways to get hot water without waiting. The guys ask "What Is It?"