Air handlers work in conjunction with the outdoor air conditioning or heat pump units to offer cooling or heating for the home. The Air Handler is made up of several components such as the evaporator coil and blower motor. The Air handler distributes the air thru the ducts of the home via its supply. The return section of the air handler cycles the air into the air handler and makes it cold or hot. Once the temperature reaches the desired level set by the thermostat, the systems cycle for heating or cooling is complete Choose Which Style is the Best for your home? Air Handlers come in a few varieties to accommodate different installations, for example there are Ceiling Mounted, Wall Mounted and even Multiposition. A few years ago, a student of mine told a funny story in a home energy rater class. He was an HVAC contractor and said he was installing a new air conditioner for an elderly woman. As he was explaining things to her, he mentioned that they would be installing a 4 ton unit.

"Oh, my," she said. "How are you going to get something so big into my backyard?" The confusion here is completely natural. vrf ac unitHVAC and home energy pros find this story funny because when you say an air conditioner is 4 tons, we know it's not weight. ac repair services dwarkaIt's a number that tells how much heat the air conditioner can remove from the house in an hour. coleman furnace parts calgary(Let's ignore the issues of nominal vs. actual capacity and AHRI de-rating.) A 4 ton air conditioner is one that can remove 48,000 BTUs of heat per hour from the house. For most people, though, 4 tons means 8000 pounds. (A BTU is a British Thermal Unit, approximately the amount of heat you get from burning one kitchen match all the way down.) Most pros also know how such a common term as 'ton' turned into a bit of HVAC jargon.

Before Willis Carrier invented the modern air conditioner, people used to cool buildings in the summertime with ice harvested from rivers and lakes in the wintertime. A Green Homes America article quotes ice production figures from the 19th century Ice and Refrigeration journal, indicating that the 1890 crop from the Hudson River was about 4 million tons. OK, so people used to cool and refrigerate with ice. How does that equate to air conditioning capacity in BTUs per hour, you ask? Well, let's get quantitative and find out. When ice is below freezing and it absorbs heat, the temperature increases. When ice is at its melting point, 32° F, and it absorbs heat, its temperature doesn't change. If you've had a physics or chemistry class, you may recall that the amount of heat needed to melt ice is called the latent heat of fusion. In Imperial units, that number is 143 BTUs per pound. That's actually a lot of heat to pump into a pound frozen water. Once the ice is melted into liquid water, it takes only 1 BTU per pound to raise the temperature 1 degree.

So if you've got a pound of ice at 32° F, you put 143 BTUs into it to melt it completely. Then it takes only 180 more BTUs to raise the temperature of that pound of water from 32° F to 212° F, the boiling point. Anyway, getting back to our main discussion, if you have a ton of ice, it takes (143 BTU/lb) x (2000 lbs) = 286,000 BTUs to melt it completely. You could do that in one hour or 10 hours or a year, depending on how quickly you pump heat into it. Somewhere along the line, though, someone decided to use 1 day—24 hours—as the standard time reference here. If the ice melts uniformly over the 24 hours, it absorbs heat at the rate of 286,000 / 24 hrs = 11,917 BTU/hr. Rounding that number up makes it a nice, round 12,000 BTU/hr. In air conditioning jargon, then, a ton of AC capacity is equal to 12,000 BTU/hr. If you're wondering how this term got institutionalized, it was probably the usual way. People in the industry start using it, and then the professional organizations make it official.

An architecture website has a quote from 1912 that claims the American Society of Mechanical Engineers standardized it. It sounds likely, but their numbers don't work out, so I'm gonna go with Honest Abe on this one and remain skeptical. For the fearless: If you want to read some funny HVAC banter on this topic, check out this thread in the HVAC-Talk forum. And if you figure out what 'heat of zaporization' is, let me know! It's Called an Air Conditioner — Not an Air Cooler! 5 Questions to Ask When Replacing Your Air Conditioner , used under a Creative Commons license. Photo of ice harvest by Robert N. Dennis, in the public domain, from Wikimedia Commons. Abe Lincoln photo and quote from The Canterbury Tales by Chaucer. heating & cooling distribution, Keep your home comfortable all year round with this high quality and efficient 14 SEER sweat heat pump system. This system is ideal for new or replacement residential or commercial applications, and consists of the outdoor condenser, indoor air handler with evaporator coil, heat strip, and 30 ft. line set.

The multi-positional air handler houses a micro-channel coil which is filled with dry nitrogen, and includes a 1 in. filter rack. The included line set with 3/8 in. liquid line and 7/8 in. insulated suction line is 30 ft. in length and may be cut to the desired length to customize the installation. 240-Volt, 36,000 BTU central heat pump system includes a factory charged R-410A outdoor condenser, indoor air handler with evaporator coil, heat kit, and 30 ft. line set Multi-positional air handler with built-in filter rack features easy plug-in heat kit with circuit breaker for second stage heating applications 30 ft. line set includes 3/8 in. liquid line and insulated 7/8 in. suction line and may be cut to length in the field to customize the installation Designed to be used as new and replacement ducted, forced air electric heating and cooling applications; This question is from 3 Ton 14 SEER R-410A Split System Package Heat Pump System1 Do these units come in natural gas