The data provided herein applies to United States households.
The average power consumption of 28,000 BTU air conditioners is 357 kWh per month.
28,000 BTU air conditioner units are typically in the 9-10 EER range, and the wattage of most of these units ranges from 2,800 watts to 3,100 watts. As is the case with the 24,000 BTU, the EER of these units is not the best. To be fair, larger units often have lower EER ratings than smaller ones.
28,000 BTU air conditioner units can cool rooms up to 1,900 square feet. Bear in mind that this does not include rooms in megathermal/tropical climates).
The best thing you can do efficiency-wise is to find the highest EER for the unit which matches your room best. This means that if your room needs 28,000 BTU, you should still get a 28,000 BTU unit, but just find the most efficient 28,000 BTU unit you can.
One way to do that is to check the listings for those units on our appliance finder, which sorts units by their electricity consumption, and provides a monthly power cost estimate.
Estimated Monthly Energy Usage Range Of 28,000 BTU Air Conditioners
330 to 357 kWh.
At the U.S. national average electricity rate of $0.12 per kWh, that works out to an operational cost of (energy only, not including maintenance):
$39.60 to $42.84/Month.
Thermostat temperatures above 25 °C are assumed. This includes both inverter and non-inverter units.