The average power consumption of 18,000 BTU air conditioners is 185 kWh per month.
There are uncommon air conditioner sizes in the 12,000 to 18,000 BTU range, including 13,000 BTU, 14,000 BTU, 15,000 BTU, and room size calculations sometimes yield results that don’t match any unit (or extremely rare units) on the market (such as 16,000 BTU).
In such cases, your installer might recommend a slightly (or even considerably) larger unit (such as an 18,000 BTU unit) if that’s all they can find.
The power draw/wattage of 1.5 ton air conditioners typically ranges from 1,470 watts to 1,614 watts, and have EERs ranging from 11 to a little over 12.
Always remember that this isn’t the units’ cumulative power consumption, this is the wattage (if they are operating at their maximum settings. i.e. their lowest temperature setting and highest fan setting). The EER is normally printed on the yellow energy label, if any.
Always go for the best! EERs in the 12 range aren’t too hard to find, so buy air conditioners with an EER exceeding 12. The difference between 11 and 12 isn’t particularly significant, though. Be sure to get a unit that is offered with solid support (this entails buying it from a reputable store that offers free maintenance within a reasonable warranty period).
Fortunately, there are inverter air conditioners in this range, and inverter units are capable of consuming 50%-60% less energy than their non-inverter counterparts under some circumstances (your chances of saving that much increase if you’re a regular A/C user).
If you’re also seeking information on refrigerator power consumption, Kompulsa has a page dedicated to that, with the power consumption data organized by refrigerator size and configuration.
Estimated Monthly Energy Usage Range Of 18,000 BTU Air Conditioners
169 to 185 kWh.
At the U.S. national average electricity rate of $0.12 per kWh, that works out to:
$20.28 to $22.20/Month.
Thermostat temperatures above 25 °C are assumed, and the figures above are for United States households. This includes both inverter and non-inverter units.