How much you need to spend depends on your cooling requirements. PACs are rated in British thermal units (BTU): one BTU is the amount of heat needed to raise the temperature of one pound of water by one degree. A higher rating means an air conditioner can cool a larger space, which normally means the unit itself will be larger and more expensive. A 9,000BTU unit will handle a space of approximately 45 cubic metres, while a 12,000BTU unit could go up to 90 cubic metres. Measure your room before you buy to make sure you choose an air conditioner that’s up to the job.

My question relates to how the kitchen bump up intersects with the common advice that if you oversize your unit, then it can lead to short cycles that leave you with humidity and wear out the equipment. No article online seems to makes clear how much wiggle room you have before that might happen, and often it’s simultaneously encouraged to go one higher than you need. Hence this 4000BTU kitchen bump comes to mind and whether that’s enough to amount to a harmful oversize during the majority time the kitchen is not used.In our experience, Midea makes solid air conditioners that are good value, but they don't always feel as premium as their more expensive cousins. Here’s why it’s complicated. When my dad first put in central air in 1993, he bought me a Carrier Siesta II, 8,000 BTU unit (which has since literally disintegrated) for my bedroom (measuring about 179 sq. ft.). When my brother came to visit in the summer, it had to do for both bedrooms and the hall. I don’t sleep up there much anymore, but I used to run the Carrier to keep the upstairs at least dehumidified and not ungodly hot, partly because I have valuable tapes and books up on the hallway landing and in both bedrooms. There used to be enough cooling from the central HVAC system to cut the heat, as well; the new one (just installed through a Habitat program) doesn’t seem to be doing as well, though it reduces the humidity a little. (The former was a 2.5 ton Lennox, the new a 3-ton Goodman.) Once we had the Midea placed in our room of choice and out of the box, the installation process was a breeze. If it breaks we'll fix it, if it develops a fault we'll get it working again. We'll instruct either the manufacturer or a certified repair centre to repair it. Inverter compressors are also quiet, but Midea U doubles down on silence with its U-shaped design. This form factor allows the window pane to slide down between the AC and compressor compartments, acting as a sound barrier.

Now, 1 mini split with 1 air handler (single-zone) won’t work, since you have 3 stories and a lot of rooms. Ideally, you should use 1 air handler per 1-3 rooms. In your case, it would make sense to get a 4-zone or 5-zone mini split (these units consist of 1 outdoor unit and 4 or 5 indoor air handlers). Let’s say you are using five 12,000 BTU indoor air handlers (for a total cooling output of 60,000 BTU or 5 tons). You would put 1 air handler on the 3rd story, 2 in the 2nd story, and 2 in the 1st story. This is how you think about adequately providing both cooling output as well as much-needed airflow and output distribution.

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Our data shows that they use as much energy in an hour as a typical fridge freezer uses in one day.

Hello M, nice plan. Your calculations for the master bedroom with bathroom and another bedroom sound about right. The cathedral ceiling open concept area is fun indeed. 🙂 Calculating the full volume of that area is a bit complex. Let’s simplify it a bit; a 1,000 sq ft area with 16 ft average ceiling height. For that you would need somewhere between 40,000 and 50,000 BTU; depending on insulation, sun exposure, and so on. I’m never quite sure if the spirit of the advice not to oversize is not to say install a 30,000BTU unit when you needed a 6,000BTU but perhaps there is much less harm if you install a 15,000BTU when you needed a 10,000BTU? Do you have any thoughts on what a safe buffer/range is if you’re trying to balance different operating scenarios? Question: What is the 12,000 BTU air conditioner room size? 12,000 BTU is equal to 1 ton; we’re talking about 1 ton AC room size. Answer: Using the EPA’s 20 BTU per sq ft rule of thumb, the room size of 12,000 BTU air conditioners is 600 sq ft. Equally, 1 ton AC room size is about 600 sq ft.The building is a townhouse with 3 floors and the room is on the 3rd (top floor) and is directly under the roof which gets the hot sun of San Diego. The bedroom also has an attached bathroom and is the only thing on the top floor next to a very small hallway up a flight of stairs. This is also the only room in the house that will have an ac ( we are renters and that is nonnegotiable at the moment) and the house in general and especially that room gets quite hot in the summer. There are three main types. Desk fans, as their name suggests, are smaller fans designed to sit on a desk or table and cool you while you sit close by, while pedestal and tower fans are designed for a whole room. Appearance-wise, the device is compact, measuring just 20 x 20 x 25cm and we love that the unit sat neatly on our desk without being too much of an eyesore, while the LED light is a lovely touch and there are a selection of colours to choose between. This B+D unit surprised me with its strong cooling capacity. On average, portable AC units tend to be less powerful than window ones, but this machine is right up there with the best window units.

It's pretty simple to plug it in, connect the extractor hose and put it out a window, and get it working. As I’ve never had a/c it’s hard for me to imagine one handler cooling several rooms, even with the appropriate btu’s for square footage, thank you for your help! Reply They come in various shapes and sizes, but are often described in terms of their BTU (British thermal unit) output. Hose length. Make sure the exhaust hose is long enough to reach the window you will be expelling the hot air through. Most are 1.5m long. Power cables are usually the same length, so bear that in mind too.Given these this range of uses–one for the whole upstairs and one for the south bedroom only–do you think I need a unit with more than 10,000 BTUs? For several reasons, I’d rather not install a unit for each bedroom. We also liked that the unit provided a clear and constant update of the room temperature and that you're able to set a timer and change the settings easily from the unit or with the remote control. In our testing, it reduced a medium-sized room from 25C to 21C in about 90 minutes, which isn't bad, but also isn't as fast as some of the other options on this list. Now, the people are what really makes the difference here. According to the AC sizing, you have to add 600 BTU for each person if there are more than 2 persons in the room. In your case, you will have to add (in theory) 148 x 600 BTU = 88,800 BTU or 7.4 tons. So, combined, you are looking at a theoretical calculation of 14.15 tons. That’s quite a lot. We find a lot of customers get these units for bedrooms,” says Appliance Direct’s Jake Crossley. “7,000 BTUs is the output we would recommend for rooms up to 18 square metres. Any larger and you won’t get the full benefit.”