I’ve been crunching some numbers as my electric bill has gone up with ac usage…
1. A conventional window unit ac for 4 hours uses approx 1.84kWh. (4amps x 115 volts = 460 watts of power. Or $0.31 per day.
2. A ductless window unit (that I found off HD) for 4 hours uses approximately 11.5kWh (25 amps x 115 volts = 2875watts of power. Or approx $2 a day at $0.167 per kWh.
Someone please big brain me.
In: Engineering
Does the ductless window unit need to be on constantly in order to achieve the same result as the other one?
Are you accounting for the cooling capacity of the unit? Or how often the unit us actually running?
Higher capacity units will always draw more power because they need a larger compressor. Look for the “Capacity” values in the specs for the units to compare.
Many newer pieces of equipment can draw more power per unit of time, but IF they are sized and installed correctly for the application, they can be more efficient.
One big advantage of the ductless systems is that they can be mounted on walls, instead of in windows, so they’re great for interior rooms in a home. If you do want to install a ductless unit on your wall, though, I strongly recommend talking to a professional, as they’re a little more complicated than window units, and most people don’t think about the fact that you need somewhere for the condensate to go.
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