Pull the expanded performance data off your faorite brand of ac or copelands website.Nice article Allison.

Rules of thumb don't work. AHRI's indoor operating conditions vs. actual operating conditions. Our design temperature is 92° F, which means that the air conditoner has an easier job of dumping heat into the outside air than it would if it had to dump the heat into 95° F air.If you live in Tucson, Arizona, with a design temperature of 103° F, however, your 3 ton air conditioner has now dropped in capacity again. Of course, there are more than 3 reasons that your 3 ton air conditioner isn't really 3 tons, starting with the fact that it's not 3 tons in weight. Well, let's frame that a little differently. Which way do you think it would go if we bring cooler air into the air conditioner than it was rated for? You need to know how things really work and do the math for that.Home Energy Partners out of Ashville, NC put together a great Manual S spreadsheet that automates a lot of the calculations. Nameplate capacity, also known as the rated capacity, nominal capacity, installed capacity, or maximum effect, is the intended full-load sustained output of a facility such as a power plant, electric generator, a chemical plant, fuel plant, metal refinery, mine, and many others. That's why I recently heard someone say that thumbs are great things, but it's good to recognize their limitations. Is it harder to cool cooler air or warmer air? Nameplate capacity is the number registered with authorities for classifying the power output of a power station usually expressed in megawatts (MW). A scan of the AHRI data shows the reported values within a nominal SEER family of products varies significantly. They have posted a video explaining how it works. Having opposable thumbs allows us to write a letter, examine a mulberry, and hold a glass of beer, but no matter how great they are, they can't design HVAC systems. A 3 ton air conditioner has a nominal capacity of 36,000 BTU per hour, but the actual rating using the operating conditions specified by As David Butler discussed in his article on Manual S, AHRI ratings are done for an indoor dry bulb temperature of 80° F and indoor wet bulb temperature of 67° F. Let's think about the temperature difference and see what effect that might have on the cooling capacity.

As David wrote, it's a moving target, but the net result of AHRI's operating conditions is that your air conditioner's capacity is lower than it's rated (unless you keep the thermostat at 80° F or higher).AHRI uses 95° F as its outdoor test temperature, so if your outdoor cooling design temperature differs from that, your AC capacity will again vary from the AHRI rated capacity.

Similarly, a "SEER X" isn't always a SEER X. Just ask the folks at the Microkelvin Laboratory at the University of Florida, where they get about as close to absolute zero as is possible.If it's harder to cool air at 75° F than air at 80° F, then that means the 2.8 ton air conditioner above isn't even going to be 2.8 tons. The best way is to have a blower than can vary the speed in real time to meet load requirements. David Butler wrote about two of these reasons in a guest post on The first reason is that when we talk about air conditioner capacity, we're usually giving the nominal size. You can trade sensible and latent capacity by varying the airflow on the indoor coil.

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