Boehmer Heating & Cooling Blog: Archive for May, 2011

Air Conditioners and Humidity

Friday, May 6th, 2011

Ever wonder why all of those air conditioners hanging out of people’s windows are constantly dripping water on hot summer days? All they’re actually doing is disposing of the moisture they’ve removed from the indoor air. That’s right – air conditioners are dehumidifiers too.

When you think about it, it makes a lot of sense. After all, you know how much more uncomfortable 90° is when the humidity’s up around 90% than when it’s closer to 60%. Of course, some air conditioners are better at removing moisture from the air than others, so you should definitely consider how well an air conditioner dehumidifies when evaluating your air conditioning options.

Why Humidity Matters

High humidity, even at lower temperatures is uncomfortable. But there are more reasons than simple comfort to want an air conditioner that reduces indoor humidity levels. For instance, high levels of humidity promote the growth and spread of several allergens like dust mites and mold spores. High indoor humidity can also cause problems for the wood fixtures and furnishings in your home.

The Importance of Proper Sizing

Most air conditioners do a decent job of controlling humidity indoors. But depending on the severity of your problem and the typical levels of humidity in your area during the summer months, you may want to pay special attention to each unit’s capabilities when evaluating your options.

An air conditioner’s ability to maintain proper humidity levels indoors has a lot to do with how well it’s matched to the size of your room as well. An air conditioner that’s too small likely won’t get the humidity or the temperature down to a comfortable level. On the other hand, that doesn’t necessarily mean that bigger is better.

In fact, an air conditioner that’s too large for the space you’re using it to cool will have a hard time bringing down the humidity level. Sure, you’ll wind up with a cold room, but that room will remain damp, making it no more comfortable than it was before the air conditioner was turned on.

For all of these reasons, it’s important to carefully evaluate your options when buying an air conditioner and make sure that the unit you buy is the right kind and size for the area you’re cooling. A little extra time spent researching your options will make your home infinitely more comfortable this summer.

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What to Do if Your Ceiling Fan Does Not Work

Wednesday, May 4th, 2011

A ceiling fan is a great addition to your home. It can keep you cool all on its own on moderately warm days and it will help to take on some of the cooling load even on days when you do need to use the air conditioner as well. Plus, you can even use your ceiling fan in the winter to keep the warm air from your heating system circulating properly.

But just like anything else, your ceiling fan will encounter some sort of problem from time to time. While there are certainly some things that you cannot fix on your own, it is a good idea to check on a few items before you call in a professional repair person.

For instance, if you switch on the fan and nothing happens, make sure that all of the controls are in the place they should be. Most ceiling fans have a chain or dial on the body of the fan itself that controls the direction that the fan turns and can even turn it off. However, there is usually also a power switch on the wall. If you flip the switch and the fan does not turn on, there is a good chance that the setting on the fan itself is in the off position.

After ensuring that all of these switches and controls are calibrated properly, you can also take a look at the fuse and the breaker that the fan is connected to. If the breaker is thrown or the fuse is blown, the fan is not getting power and you will have to replace the fuse or reset the breaker to restore power to that circuit.

If that does not solve the mystery either, you may want to test the blades themselves to see if they seem to be stuck on a physical impediment. Ceiling fans do occasionally need to have their bearings lubricated and this is a relatively simple task that you can carry out on your own as well.

However, if none of these actions seems to solve the problem, then you will probably need to call in a professional to assess the situation and make the necessary repairs. There may be a mechanical problem within the fan itself or the wiring could be frayed or fused and these are not repairs you should attempt to make on your own.

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What Is a Chilled Beam System?

Monday, May 2nd, 2011

If you’ve been researching new ways to cool larger office or industrial spaces, chances are you’ve come across information on the chilled beam system. These systems are not suitable for residential use, but they can be extremely effective in other types of applications. They’ve been used more extensively overseas, but are rapidly gaining ground in the US.

How They Work

In a chilled beam system, cooled water is sent through pipes into a beam that runs across the ceiling of an area. The water chills the beam, which in turn passes that chill to the air in the room. As the air in contact with the beam cools, it also becomes denser and sinks, thereby making room for warmer air to rise from below and contact the beam. In this way, air is both cooled and circulated throughout the room.

Active vs Passive

Chilled beam systems are available in both active and passive implementations. Passive systems rely solely on the natural convection currents to circulate air and bring warmer air into contact with the beam. Active systems, on the other hand, make use of a central air handler and ducts to bring new air into contact with the beam and circulate air around the space to be cooled.

Passive systems, of course, use less energy than active ones, but their application is also more limited. Active chilled beam systems are still much more energy efficient than many other types of industrial or commercial cooling systems and they can be integrated into many more types of spaces.

System Advantages

Energy efficiency is certainly a very attractive feature of chilled beam systems, but they have several other solid selling points. For one thing, chilled beams operate extremely quietly because of their lack of moving parts. This also makes them much easier and cheaper to install and maintain. And because of the simplicity of their design, chilled beam systems don’t require that a large amount of space be devoted to a machine room or control center, making them an excellent choice when space is at a premium.

Limitations

Of course, chilled beam systems aren’t without their drawbacks. For one thing, these systems can cost quite a bit more than other more conventional systems because they must be imported from overseas. There is also a limit to how much cooling they can accomplish because if the temperature of the beam itself drops below a certain level, condensation will begin to form.

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