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How to Heat a Swimming Pool with an Air Conditioner | Ask This Old House

This Old House · 1.2M views · 2016-01-01 · 7:26

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Overview

A This Old House segment where Richard Trethewey installs a heat exchanger that uses waste heat from a central air conditioner to heat a swimming pool.

On Hacker News

HN cites it as a practical demonstration of reusing AC waste heat, in threads about heat recovery.

Discussed on HN; no positive recommendation is recorded in this export · HN mentions 2019–2026

Topics

Power grid, heating & buildingsHome, DIY & practical skills
Search by tags
air conditionerheat exchangerpool heatingplumbingwaste heat

What people said

alexpotato · 2026-07 · Reference

This does exist btw. It's a stainless steel coil that you can put on your A/C and then run water from your pool over it to heat the pool. [VIDEO]

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energ8 · 2020-04 · Reference

From my reading of heat pumps, mismatches in energy sources and sinks can make linking things together more complicated (aka more expensive) than is commonly available. For the pool <-> A/C case, This Old House did a segment on linking the systems: [VIDEO] Edit: chris_va has more details about why linking systems is hard: [LINK]

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MichaelApproved · 2019-10 · Reference

Houses with pools should use the waste heat from their air conditioning system to heat their pool. Unfortunately, the system requires an HVAV technician, an electrician, and a plumber to install. I’m also not sure how many HVAC techs are familiar with installing something like that. Seems like a great energy saver though. Here’sa video from This Old House on installing one of the systems. [VIDEO]

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Sources

Video by This Old House, played through YouTube.

Data and selection notes

HN summaries and labels may contain AI errors. HN dates refer to discussions, not video publication.

HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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