1,531 posts, read 2,369,379 times I will be purchasing a new AC and furnace to take advantage of rebates. But I don't know the difference between 4 and 5 ton. I live in Texas and it gets hot for three months out of the year but I will also have sprayed insulation in the attic with the possibility of radiant barrier also installed depending on the price of the barrier. Thxs in advance for your input. 635 posts, read 2,279,224 times Originally Posted by eyewrist Not to belabor the point, but did someone spec the 4 ton based on an actual cooling load/heat loss calculation? I really do see some old timers say things like, "well, you have 2200sqft and all my years tell me you need 4 ton", but don't take into account the new tech, insulation, etc. I'd get a couple/three calculations done and hopefully they'll all be close. If not, I'd ask questions why. I'd also suggest doing some individual research into pricing and rebates for higher SEER units. When we installed our 15ish SEER unit a couple years back, it was not significantly more expensive than the 13 SEER option.

Any pro worth their salt will be happy to do heat loss/cooling load calc for free or a small fee as part of the estimating process. central ac units costIf they refuse, I'd think about sending them on their way.spot ac unit While the SEER 16 may be more expensive than a SEER 14 for example, depending on you electricity rates, the breakeven point might not be that long. heating cooling units through wallIn Huntsville, our electricity is cheap, like $0.09/kwhr. Back where I lived in Los Angeles it was between $0.15 and $0.25 so a high SEER AC would be a good idea in LA. Originally Posted by al_roethlisberger I have a couple of more bids coming in and I will ask them but the previous one didn't discuss that with me. Originally Posted by Charles

Here in Texas it is in the range of 0.11 to 0.12/kwhr depending on the company you go with and what plan you choose.Commercial refrigeration systems in the US are mostly rated in tons of refrigeration and this term is used widely in other parts of the world. However, outside the US, cooling systems may be normally specified in kW (or MW) or in Btu/h. The roots for refrigeration are in the ice making industry, and the ice manufacturers wanted an easy way of understanding the size of a refrigeration system in terms of the production of ice. If 288,000 Btu are required to make one ton of ice, divide this by 24 hours to get 12,000 Btu/h required to make one ton of ice in one day. This is the requirement for the phase change from liquid to solid — to convert water at 0°C (+32°F) into ice at 0°C (+32°F). As a practical matter, additional refrigeration is required to take water at room temperature and turn it into ice. To be specific, one ton of refrigeration capacity can freeze one short ton of water at 0°C (32°F) in 24 hours.

So, a ton of refrigeration is 3.517 kW. This is derived as follows: The latent heat of ice (also the heat of fusion) = 333.55 kJ/kg = 144 Btu/lb One short ton = 2000 lb Heat extracted = 2000 x 144/24 hr = 288000 Btu/24 hr = 12000 Btu/hr = 200 Btu/min 1 ton refrigeration = 200 Btu/min = 3.517 kJ/s = 3.517 kW = 4.713 HP A much less common definition is: 1 tonne of refrigeration is the rate of heat removal required to freeze a metric ton (1000 kg) of water at 0°C in 24 hours. Based on the heat of fusion being 333.55 kJ/kg, 1 tonne of refrigeration = 13,898 kJ/h = 3.861 kW. Thus, 1 tonne of refrigeration is 10% larger than 1 ton of refrigeration. Another unit of measure is the calorie which is the amount of heat removal required to raise or lower the temperature of one gram of water by one °C. A kilo-calorie is the amount of heat required to raise or lower 1 kg of water by 1°C. One ton of refrigeration is equal to 3024 kilo-calories per hour. This is 12,000 BTU/ h divided by 2.204 (pounds per kilogram) divided by 1.8 (°C to °F).

Most residential air conditioning units range in capacity from about 1 to 5 tons of refrigeration or 3.5 kW ~ 17.5 kW, or 12,000 Btu/h ~ 60,000 Btu/h. Large industrial chiller systems range up to 800 tons of refrigeration (2.8 MW or 9.6 million Btu/h). Packaged Terminal Air Conditioning 15,000 BTU (1.25 Ton) + 5 kW Electrical Heater 15,000 BTU PTAC unit has a wireless remote and is pre-charged Product sold without installation or permitting Equipment should be sized/installed by a qualified professional Ramsond Packaged Terminal Air Conditioners (Commonly known as PTAC) are ideal for application in hotels, motels and apartments, where the environment of a single area or zone, such as a room, with an outside wall needs to be controlled. As the name implies, a single package contains all the components of an air-cooled refrigeration and air-handling system. The entire package is self-contained. Ramsond PTAC systems are designed for through-the-wall installation, with decorative outdoor grills.

Ramsond PTAC units come standard with electric heating. They come complete with easy to install wall sleeve, decorative rear grill, wireless remote control and wall mount cradle, wired thermostatic control system, integrated control panel and LCDI plug. Ramsond PTAC systems are easy and quick to install. They are versatile and efficient and can be installed in variety of zones. They are integrated with the most reliable components available in the market. As such, they are backed by one of the best warranties in market. They are far more advanced than conventional air conditioning systems. Ramsond PTAC systems are not only sleek and stylish, but are super-efficient and economical. For these and other reasons, Ramsond PTAC units have become the preferred choice of many HVAC professionals worldwide. Full and complete system: includes PTAC system with integrated control, wireless remote control and cradle, wired thermostatic control system, sleeve, decorative grill and LCDI plug Versatile and efficient and can be installed in variety of zones