A cheaper way to cool homes, particularly for renters

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US Edition - Today's top story: How window-mounted heat pumps can give tenants efficient heating and cooling View in browser

15 June 2026

US Edition

The Conversation

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Summer heat is here, and my home cooling system is on. A few years ago, my family swapped out window air conditioners for a mini-split heat pump system that’s more efficient. But many people either rent their homes or don’t have the money to spend up front to install a system like that. 

Smaller, window-mounted heat pumps are now becoming available in the U.S., so I asked Moncef Krarti, a scholar of energy efficiency at the University of Colorado Boulder, to explain what they are, how they work and how their efficiency differs from both whole-home heat pump systems and traditional window air conditioners.

He lays out the similarities and differences, and points out some key factors to consider if you’re thinking about buying one of these units, which could help you keep your home cooler in the summer – and warmer in the winter – for less money than you might be spending now.

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Jeff Inglis

Environment + Energy Editor

 
Many U.S. apartments have individual heating and cooling systems that are less efficient than current technology. Spencer Platt/Getty Images

How window-mounted heat pumps can give tenants efficient heating and cooling

Moncef Krarti, University of Colorado Boulder

Permanently installing a heat pump system in a building is expensive. But new window units can deliver many of the benefits with far less cost and go with renters when they move.

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