What tonnage is a Lennox 411?

According to the Technical Reference Guide the first two digits in the second group are Mbtu. 411 = 41,000 btu, 311 = 2 1/2 tons.

How do I know the tonnage of my Lennox air conditioner?

For Lennox, you should look for the second cluster of digits of the model number. It will be a number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. A ton of air conditioning equals 12,000 BTU, and 48 divided by 12 equals 4, so the data plate below indicates the system is 4 tons.

How do you decode a Lennox serial number?

Lennox air conditioner serial numbers are composed of 10 characters that follow a specific pattern. That pattern is four digits, one letter, and five more digits. Using 5621M 99989 as an example, the first two digits (56) indicate which of Lennox’s several manufacturing facilities produced the unit.

What size AC unit do I need?

As a rule of thumb, an air conditioner needs 20 Btu for each square foot of living space. But other considerations, such as the ceiling height and the size of your windows and doorways, might call for more cooling power. To measure your room, multiply the length by the width.

How can I tell the tonnage of my AC unit?

Find the model number. Within this string of letters and numerals, you should find an even, two-digit number. The possibilities on residential units range from 18 to 60. Divide the number by 12 (which represents 12,000 Btu/hr, or one ton of cooling capacity) to get your AC unit’s tonnage.

What is AC tonnage?

What Does the Term “AC Tonnage” Mean? In the HVAC field, a ton, or tonnage, refers to the cooling capacity of an air conditioner. Tonnage is measured in BTUs or “British Thermal Units.” (A BTU is equivalent to the amount of energy (heat) needed to raise one pound of water 1°F at sea level.)

How do I tell what size my AC unit is?

To calculate the size of the air conditioner you need for a room, first, multiply the length of the room with its width. Then multiply it with 25 BTU to get the ample cooling for the room under different weather conditions. For example, if the room is 15 feet long and 12 feet wide, it comes to 180 square feet.

How do I know the tonnage of my AC carrier?