How to Turn an Air-conditioner Into a Heat Pump (on a 1969 Airstream Trailer): I have a 1969 Airstream Ambassador travel trailer with the original air-conditioner. I like to upgrade things while keeping them as original as possible. I decided to rebuild the air-conditioner (new compressor, new fan motor), but …
This Old House plumbing and heating expert Richard Trethewey installs a device that will heat a pool with the heat produced by an air conditioner.
This is similar to my idea to use heat dumping from a refrigerator in a water heater, except neither of those loads are seasonal.
An ENERGY STAR certified heat pump dryer helps reduce energy costs while maintaining the convenience and performance of a conventional dryer.
https://www.familyhandyman.com/article/heat-pump-dryer/
This article incorrectly implies that all condenser dryers use heat pump technology.