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S20 E33, Ross Trethewey assists his father Richard in explaining air flow to Kevin O’Connor
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S20 E33: Celebrating Fathers as Mentors

In this episode, the Ask This Old House team members talk about their fathers as mentors. Then, Richard and Ross Trethewey explain airflow in buildings, and Tom Silva finishes a baseball bat display case.

S20 E34, Nathan Gilbert discusses finish nailers
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S20 E34: Light Fixture, Finish Nailers

In this episode, Kevin O’Connor shares how he became the host of Ask This Old House, and Tom Silva shows a trick for drawing a perfect ellipse. Heath Eastman moves a light fixture, and Mauro Henrique patches the ceiling. Then, Nathan explains the basics of finish nailers.

S20 E32, Heath Eastman discusses electrical tools in the Tool Lab
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S20 E32: Electrical Tools, Energy Audit

Watch as Heath demonstrates using common electrical tools. Later, Ross conducts an in-depth home energy assessment, and Mauro shares one of his favorite painting tips.

S20 E33, Tom Silva and his parents
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Ask TOH Celebrates Their Fathers as Mentors

Ask This Old House team members talk about how their fathers shaped their lives and careers.

S20 E30, Richard Trethewey shows Kevin O’Connor how to replace a toilet seat
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S20 E30: Toilet Seat, Lockset Repair

Richard shows how to replace a toilet seat; Jenn Largesse builds a pergola for her backyard; Nathan repairs a century-old full mortise lockset.

S20 E29, Mauro Henrique refinishes a deck rail
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S20 E29: Hydrangeas, Deck Railing

Watch as Jenn shows off different varieties of hydrangeas; Heath explains the types of smoke and carbon monoxide detectors and their functions, and Mauro refinishes deck railings and posts.

S20 E28, Richard Trethewey shows Kevin O’Connor how to fix common plumbing emergencies
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S20 E28: Garage Door, Plumbing Fixes

In this episode, Ross shares why he became an engineer. Tom talks about different types of hammers, and Richard shows how to control common plumbing emergencies. Then, Nathan removes and replaces a garage door.

Mark McCullough teaches Kevin O’Connor how to build a stone bird bath
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S20 E27: DIY Birdbath, Newel Post Repair

In this episode, Nathan shows how to mount a flat-screen TV on a wall, Mark builds a stone birdbath, and Tom repairs a newel post damaged by a dog.

S20 E26, Kevin O’Connor and Tom Silva build a beehive
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S20 E26: Outdoor Vinyl Fence, Beehive

Jenn Nawada suggests houseplants for areas of shade, partial shade and sun; Jenn Largesse shows how to put up an outdoor vinyl fence; Tom Silva builds a beehive out of wood.

S20 E25, Heath Eastman discusses LEDs with Kevin O’Connor
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S20 E25: Wobbly Toilet, LED Lightbulbs

Nathan shares how he became a carpenter and what he loves about the trade; Heath talks all about different LED lightbulbs; Richard fixes a wobbly toilet and repairs a sticky faucet handle.