The Keystone 24,000 BTU window AC is designed to cool large spaces up to 1,500 square feet pretty efficiently. It's all about cooling, without any heating function, and has features like FlashCool that help chill a room quickly, according to the manufacturer's description.

From what we've gathered, folks generally appreciate how well it cools, even when things get really humid. It can dehumidify up to 3.51 pints per hour, which is nice for keeping moisture levels in check. The noise level's not bad either, around 56 dB, so it's quiet enough for spaces like bedrooms or nurseries.

But there are a few things people have pointed out that could be better. The air filter is a common gripe. Some folks mentioned it doesn't always fit right, so dust can sneak past it. If this happens, a bit of extra weatherstripping or asking for a replacement filter might help.

Others have mentioned that the instructions for maintenance could be a lot clearer. Better guidance on installation and upkeep would definitely improve the experience for many.

So, while the Keystone AC does a solid job cooling and keeping things quiet, sorting out the filter fit and enhancing the instruction manual would really help address some of the common complaints.

The Keystone 24,000 BTU Window Mounted Inverter Air Conditioner is pretty effective at cooling large rooms, tackling spaces up to about 1,500 square feet with ease. It's perfect for those really hot summer days, though it only cools—it doesn't do any heating, just so you know.

A neat thing about this unit is its inverter technology. It allows the AC to tweak the motor speed, making it about 23% more energy-efficient than standard window units, at least according to the manufacturer's description. So, you might save a bit on electricity, especially during those long heatwaves.

The AC also has some handy features like an energy saver mode, sleep mode, and a 24-hour programmable timer. From what we've found, folks like these features because they let you set up cooling schedules that suit your lifestyle without jacking up your energy use.

On the downside, if you're looking for something that also heats, this model won't cut it. You'd want to look at other products for that. Just keep in mind that, based on our research, other Keystone models with heating might not be the best if you need serious warmth.

Overall, if cooling a large area efficiently is your main goal and you want some nice, user-friendly controls, the Keystone 24,000 BTU AC seems like a solid pick. It should keep you comfortable during those scorching months without too much hassle or expense.

The Keystone 24,000 BTU Window Mounted Inverter Air Conditioner is designed to keep things cool without being too loud. While the manufacturer's product description doesn't list an exact noise level in decibels, we found that this model generally runs quieter compared to many standard air conditioners. This is mainly because of its inverter technology, which tweaks the motor's speed as needed instead of running full blast all the time.

From what we've gathered, people's experiences with the noise levels vary a bit. A lot of folks appreciate how quietly it operates, which is great for anyone who wants a calmer environment at home or work. That said, a few people noted that it can get a bit noisier when it’s working hard, especially when the weather is really hot.

Apart from being relatively quiet, the air conditioner is meant to cool large areas up to 1,500 square feet and it's pretty energy efficient thanks to the inverter technology. It also comes with handy features like a remote control, energy-saving modes, a sleep mode, and a programmable 24-hour timer, making it easier to control your comfort levels.

While it can dehumidify up to 3.51 pints per hour, which might cut down on the need for other noisy cooling devices in humid conditions, some folks mentioned concerns about its durability and noise during really hot spells.

So if having a quieter air conditioner is a big deal for you, the Keystone could be worth checking out. Just keep in mind the mixed feedback and maybe consider warranty options for peace of mind.