One tenant's attempt to stay cool turned into a frustrating utility surprise after a broken window AC was replaced with a smaller unit, causing their monthly electric bill to soar.
The installation itself also stood out as being particularly bad. The unit was reportedly fitted with wood, foam, and tape, and the tenant said they could even see daylight around it.
Here's what to know
In a post on the r/HVACAdvice subreddit, the original poster explained, "I had a new, smaller window unit installed two months ago. My electricity bill jumped from $100-140/month to $240-290/month!"
OP went on to ask the community for advice about how to address the situation.
Responses to the post focused on two main possibilities: weak insulation around the unit and a replacement AC that may simply be less efficient.
One commenter wrote, "Wood isn't a great insulator. Honestly just need to probably fix the insulation and look at the seer rating. Sounds like the guy who installed it did an awful job." The OP then suggested the installation may have been improvised. In reply, the tenant said, "Exactly what it is, they told me they never installed one before!"
Part of the OP's higher bill could have come from the replacement unit itself. If the new model has a lower efficiency rating or lacks more advanced compressor technology, it can use more electricity to provide the same cooling, and a smaller unit may also run longer if it struggles to keep the room comfortable.
For a bill spike after an AC replacement, the first things to examine are fairly straightforward. Look for visible openings, check for warm air around the frame, compare the specifications of the old and new units, and make sure the replacement is properly sized for the room.
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Where can I learn more?
The Reddit thread raised two basic questions: Is the new unit inefficient, or is the installation letting cooled air escape? A few other cooling-cost stories help put that in context, showing how thermostat settings, dry mode, and simple maintenance can change how hard an AC has to work.
• A homeowner found their bill was cut in half after testing a thermostat setting tweak.
• During hot weather, many households stayed comfortable by running dry mode all summer.
• One homeowner said the difference was phenomenal after cleaning an overworked air conditioner.
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