I agree. They're always trying to get you to buy a new unit with all kind of promises about how much you'll save in electricity. Nonsense. They're just another type of car salesman. I will look into getting a new door seal.You are not likely to see huge power savings with a new model. Despite wild claims of superior efficiency, the Carnot cycle is what it is, and it takes energy to move the heat. Period, end of story. When the door is opened and/or new stuff placed in, the compressor must perform work.
You will see claims that new fridges consume 30% less energy. Maybe... New refrigerants are not more efficient or more effective than R12 or R22. The insulation will probably be better.
I used a Kill-a-Watt on my old fridge and was surprised at just how little power it consumed. The compressor draw was about 250W, (the very fast defrost cycle was about 600W) and about 1.5Kwh per day (20c per day)
I'd keep an older conventional fridge over many of today's offerings.
My old York heat pump still works. It's about 30 years old or more. I paid an HVAC guy to work on it for $325 last year because it wouldn't defrost, but it does now. A few other HVAC people only wanted to sell me a new unit. There ought to be a law against that kind of thing.
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