How to calculate tonnage requirement for an Air conditioner

how to calculate tonnage requirement for an Air conditioner. All you need to know how much big your room is?

So, just find out your room floor area like (10 ft x 10ft = 100 ft²)

Divide it by 600. So, this gives you basic AC capacity. And you have to add 0.5 ton for every 5 people.

So, its like 100 divided by 600 = 0.167. Add 0.5 ton for 4-5 people living in that room which results as (0.167 + 0.5) =  0.667.

So, for 10ft x 10 ft room, usually a 0.8 ton air conditioner is enough.

Same way you can calculate tonnage require of air conditioner for any room size.

Also to mention, always go for a rotary compressor, your electricity bill would be 15-20% lower and noise would be low and cooling efficiency would be much better.

Window AC Price List and Power Consumption Comparison for 0.75 Ton

Company	Price (Rs.)	Model No.	Tonnage	Star Rating	EER	Cooling Capacity	Power Consumption
					(w/w)	(Watts)	(Units/hour)
O’General	18,500	AKGA09AATB	0.75	N.A.	2.63	2498	0.95
LG	18,000	LWA2CR1A	0.75	1	2.49	2489	1
Voltas	15,290	GOLD 2S (4011021)	0.75	2	2.55	2509	0.984
Whirlpool	17,000	WAR09G20DW0	0.8	2		2580	0.95
Carrier		GWRAC009ER001 / GWRAC009EM001	0.75	3		2928	0.96
Godrej	16,990	GWC 10GG 2 WJM	0.75	2	2.52	2505	0.994
Bluestar	16,700	2WAE081YB	0.75	2	2.57	2544	0.99
Haier	13,899	HW-09C2	0.75	2	2.66	2500	0.94

Air Condition (AC) : FAQ

• Q 1: What is 1.0T of refrigeration?

Ans: Amount of heat to be removed from 1.0T (1000 kg) of ice in order to convert it into water, within closed envolepe, in 24 hours, on or at 0 deg C.

• Q 2: What is EER?

Ans: EER (Energy Efficiency Ratio) is ratio of air conditioner cooling output compared to the power air conditioner consumes. Hence, higher the EER ratio, you’ll have more savings in electricity savings bills.

• Q 3: How to Calculate Air Conditioner Power (Energy) Consumption?

Ans: You can use following steps to calculate power consumption of your air conditioner on basis of Power Input required by it. You can find out this value in technical specifications provided by product manufacturer:

1. I am assuming 8 hours normal working hours of air conditioner in a day.
2. Actual working hours of compressor in “Cut-in & Cut-out” condition is 70%. That means 70% of 8 hours = 5.6 hours/day.
3. Assuming Electricity consumption of a 1.5 Ton 5 Star Rated AC is 1655 watts/hr which means it’ll consume 1.65 Units/hour 
4. Actual Units of electricity consumed per day = (5.6 x 1.65) = 9.24 units
5. Assuming electricity rate per unit = Rs. 5
6. Electricity consumed per day in price = (9.24 x 5) = Rs. 46.20
7. Electricity consumed per month = (Rs. 46.20 x 30) = Rs. 1386/-

•  Q 4: How to find Right tonnage AC capacity for your room?

Ans: Buying an AC with right tonnage capacity is very important for every consumer. Buying an air conditioner with wrong capacity can lead to higher power (energy) consumption and also cooling loss can happen if you bought an AC lower than the capacity required.

There is a straight thumb rule for choosing capacities as per your room area:

Upto 100 Sq. Feet = 0.75/0.8 Ton

100 – 120 Sq. Feet = 1 Ton

120 – 160 Sq. Feet = 1.5 Ton

160 – 200 Sq. Feet = 2 Ton