How much electricity does a 18000 btu air conditioner use per hour

The amperage consumed by an 18,000 BTU air conditioner powered at 220 volts is approximately 9.47 A, however, as we will see below, this value can change depending on some factors.

DON’T FORGET TO TRY: our online air conditioning consumption calculator at the end of this article.

I have created a video for our YouTube channel, “Mundochiller”, in which we detail the methodology to calculate the consumption of any 18,000 Btu/h air conditioner.

How many watts does an 18000 btu (1.5 tons) air conditioner consume?

The consumption of an air conditioner is mainly determined by the efficiency of the air conditioner, the thermal load inside the premises, the temperature of the outside environment, and the moment or time elapsed after the equipment has been turned on for the first time.

• The first step is to know the SEER parameter of the air conditioner, which is responsible for measuring the performance of the equipment.
• With the SEER parameter you can have an estimate of the average electrical power consumed by the air conditioner in Watt (W).
• ATTENTION: For a NON-INVERTER air conditioner, a SEER value less than 12 is considered.

SEER 10	SEER 11	SEER 12
1800W	1636,4W	1500 W

Table 1a AVERAGE Electrical Power according to SEER for Air Conditioning of 18000 Btu/h

SEER 13	SEER 14	SEER 15
1384,6W	1285,7W	1200,0W

Table 2a AVERAGE Electrical Power according to SEER for Air Conditioning of 18000 Btu/h

DON’T FORGET: Use our online consumption calculator at the end of this post, it’s fast and accurate.

SEER 16	SEER 17	SEER 18
1125W	1058.8W	1000,0W

Table 1b AVERAGE Electrical Power according to SEER for 18000 Btu/h Air Conditioner

SEER 19	SEER 20
947,4W	900W

Table 1b AVERAGE Electrical Power according to SEER for 18000 Btu/h Air Conditioner

SEER 21	SEER 22	SEER 23
857W	818W	782W

Table 1c AVERAGE Electrical Power according to SEER for 18000 Btu/h Air Conditioner

SEER 24	SEER 25	SEER 26
750W	720W	692W

Table 2c AVERAGE Electrical Power according to SEER for 18000 Btu/h Air Conditioner

SEER 27	SEER 28	SEER 29
666W	642W	620W

Table 1d Electrical Power according to SEER Air Conditioner of 18000 Btu/h

Air conditioning power of 18000 btu (4500 Frigories)

Don’t know your equipment’s SEER?

With the following table you can approximate the SEER value:

Air Conditioning Classification	SEER value
A+++	Greater than 22
A++	20-21
A+	18-19
A	15-17
B – C	Less than 11.5 A/A that are not inverter Very low efficiency

SEER vs A/A rating table

Example of How to Calculate the Consumption of an 18,000 Btu Air Conditioner?

Thus, for example, for an air conditioner of 18,000 Btu/hour with a SEER of 12, an average consumption of 1,500 Watts is expected.

Since the SEER is a parameter of air conditioning performance, measured under various working conditions (different condensation temperatures) it does not mean that the equipment is consuming 1500 W at all times but that, for example, over a longer period, where consumption may decrease or increase, the average will be very close to the calculated value of 1500 W.

How many amps does a 18000 btu air conditioner consume?

Using the air conditioning power consumption value of 18000 Btu/h in Watt (W) from the previous tables, the following tables are used to find the current or amperage consumption value, depending on the type of supply voltage.

	PH1	PH1	PH1	PH1	PH1	PH1	PH1
IN	110V	115V	120V	127 V	220V	230V	240V
900	11,36 A	10,87 A	10,42 A	9,84 A	5,68 A	5,43 A	5,21 A
950	11,99 A	11,47 A	11,00 A	10,39 A	6,00 A	5,74 A	5,50 A
1000	12,63 A	12,08 A	11,57 A	10,94 A	6,31 A	6,04 A	5,79 A
1050	13,26 A	12,68 A	12,15 A	11,48 A	6,63 A	6,34 A	6,08 A
1100	13,89 A	13,29 A	12,73 A	12,03 A	6,94 A	6,64 A	6,37 A
1150	14,52 A	13,89 A	13,31 A	12,58 A	7,26 A	6,94 A	6,66 A
1200	15,15 A	14,49 A	13,89 A	13,12 A	7,58 A	7,25 A	6,94 A
1250	15,78 A	15,10 A	14,47 A	13,67 A	7,89 A	7,55 A	7,23 A
1300	16,41 A	15,70 A	15,05 A	14,22 A	8,21 A	7,85 A	7,52 A
1350	17,05 A	16,30 A	15,63 A	14,76 A	8,52 A	8,15 A	7,81 A
1400	17,68 A	16,91 A	16,20 A	15,31 A	8,84 A	8,45 A	8,10 A
1450	18,31 A	17,51 A	16,78 A	15,86 A	9,15 A	8,76 A	8,39 A
1500	18,94 A	18,12 A	17,36 A	16,40 A	9,47 A	9,06 A	8,68 A
1550	19,57 A	18,72 A	17,94 A	16,95 A	9,79 A	9,36 A	8,97 A
1600	20,20 A	19,32 A	18,52 A	17,50 A	10,10 A	9,66 A	9,26 A
1650	20,83 A	19,93 A	19,10 A	18,04 A	10,42 A	9,96 A	9,55 A
1700	21,46 A	20,53 A	19,68 A	18,59 A	10,73 A	10,27 A	9,84 A
1750	22,10 A	21,14 A	20,25 A	19,14 A	11,05 A	10,57 A	10,13 A
1800	22,73 A	21,74 A	20,83 A	19,69 A	11,36 A	10,87 A	10,42 A

Table 3a Amperage vs Power vs Voltage

	PH3	PH3	PH3	PH3	PH3	PH3
IN	220V	230V	240V	380V	400V	440V
900	3,28 A	3,14 A	3,01 A	1,90 A	1,81 A	1,64 A
950	3,47 A	3,32 A	3,18 A	2,01 A	1,91 A	1,73 A
1000	3,65 A	3,49 A	3,35 A	2,11 A	2,01 A	1,82 A
1050	3,83 A	3,67 A	3,51 A	2,22 A	2,11 A	1,92 A
1100	4,01 A	3,84 A	3,68 A	2,32 A	2,21 A	2,01 A
1150	4,20 A	4,01 A	3,85 A	2,43 A	2,31 A	2,10 A
1200	4,38 A	4,19 A	4,01 A	2,54 A	2,41 A	2,19 A
1250	4,56 A	4,36 A	4,18 A	2,64 A	2,51 A	2,28 A
1300	4,74 A	4,54 A	4,35 A	2,75 A	2,61 A	2,37 A
1350	4,93 A	4,71 A	4,52 A	2,85 A	2,71 A	2,46 A
1400	5,11 A	4,89 A	4,68 A	2,96 A	2,81 A	2,55 A
1450	5,29 A	5,06 A	4,85 A	3,06 A	2,91 A	2,65 A
1500	5,47 A	5,24 A	5,02 A	3,17 A	3,01 A	2,74 A
1550	5,66 A	5,41 A	5,18 A	3,27 A	3,11 A	2,83 A
1600	5,84 A	5,58 A	5,35 A	3,38 A	3,21 A	2,92 A
1650	6,02 A	5,76 A	5,52 A	3,49 A	3,31 A	3,01 A
1700	6,20 A	5,93 A	5,69 A	3,59 A	3,41 A	3,10 A
1750	6,39 A	6,11 A	5,85 A	3,70 A	3,51 A	3,19 A
1800	6,57 A	6,28 A	6,02 A	3,80 A	3,61 A	3,28 A

Table 3b Amperage vs Power vs Voltage

Amps of a 18000 btu air conditioner

Thus, for example, for an air conditioner of 18,000 Btu/hour with a SEER of 12, an average consumption of 1500 Watts is expected, and looking at table 3a, an average consumption of 9.47 A.

How to calculate the consumption of any air conditioner AUTOMATICALLY online?

HERE CALCULATION OF AIR CONDITIONING CONSUMPTION

Your opinion is important USE the comments at the end.

Until next time! Before we say goodbye, I’ll leave you the link so you can access our free intermediate level refrigeration and air conditioning course. I hope you find it useful and that it will be of great benefit to you! Engineer Gerson Mora.