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Re: air comes but not very cool
If your house is not getting cold enough when your room A/C is turned on, It is time for a good cleaning. There are a variety of factors that may cause your A/C to not cool your house. With that said, here is a diagnostic article that provides the most probable causes of your A/C's failure to cool your house, and from there you can read it and then, step by step, rule out each possible cause listed in the article:
Read the article, and, if need be, take advantage of the link for free four (4) quotes and "pick the brain"--seek the advice--of these technicians who offer you a free quote to discern what could be the problem.
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Whole-house fans help cool your home by pulling cool air through the house and exhausting warm air through the attic.
Set your thermostat as high as comfortably possible in the summer. The smaller the difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be.
Avoid setting your thermostat at a colder setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.
Consider using an interior fan in conjunction with your window air conditioner to spread the cooled air more effectively through your home without greatly increasing your power use.
Avoid placing lamps or TV sets near your air-conditioning thermostat. The thermostat senses heat from these appliances, which can cause the air conditioner to run longer than necessary.
Plant trees or shrubs to shade air conditioning units but not to block the airflow. Place your room air conditioner on the north side of the house. A unit operating in the shade uses as much as 10% less electricity than the same one operating in the sun.
Try setting your thermostat between 72°F and 78°F. Each degree setting below 78°F will increase your energy consumption by approximately 8%. As you can see, that can add up to a lot of money over a year.
Inspect and clean both the indoor and outdoor AC/Heating coils. The indoor coil in your air conditioner acts as a magnet for dust because it is constantly wetted during the cooling season. Dirt build-up on the indoor coil is the single most common cause of poor efficiency. The outdoor coil must also be checked periodically for dirt build-up and cleaned if necessary.
Check the refrigerant charge. The circulating fluid in your air conditioner is a special refrigerant gas that is put in when the system is installed. If the system is overcharged or undercharged with refrigerant, it will not work properly. You may need a service contractorto check the fluid and adjust it appropriately.
Use bath and kitchen fans sparsely when you are running the air conditioning system.
Reduce the cooling load by using cost-effective conservation measures. For example, effectively shade east and west windows. When possible, delay heat-generating activities, such as dishwashing or baking, until the evening on hot days.
Try to not use a dehumidifier at the same time your air conditioner is operating. The dehumidifier will increase the cooling load and force the air conditioner to work harder, which in turn increases your utility bill.
Over most of the cooling season, keep the house closed tight during the day. Don’t let in unwanted heat and humidity. If practical, ventilate at night either naturally or with fans.
Room Air Conditioning Units
The unit should be level when installed, so that the inside drainage system and other mechanisms operate efficiently. If possible, install the unit in a shaded spot on your home’s north or east side. Direct sunshine on the unit’s outdoor heat exchanger decreases efficiency by as much as 10%. You can plant trees and shrubs to shade the air conditioner, but do not block the airflow.
Set the fan speed on high, except on very humid days. When humidity is high, set the fan speed on low for more comfort. The low speed on humid days will cool your home better and will remove more moisture from the air because of slower air movement through the cooling equipment. Consider using an interior fan in conjunction with your window air conditioner to spread the cooled air more effectively through your home without greatly increasing electricity use.
Set your air conditioner’s thermostat as high as comfortably possible in the summer. The less difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be. And don’t set your thermostat at a slighter setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.
Don’t place lamps or televisions near your air-conditioner’s thermostat. The thermostat senses heat from these appliances, which can cause the air conditioner to run longer than necessary.
Proper maintenance of your air conditioner will also save energy. Be sure to do the following:
At the start of each cooling season, inspect the seal between the air conditioner and the window frame to ensure it makes contact with the unit’s metal case. Moisture can damage this seal, allowing cool air to escape from your house.
Check your unit’s air filter once a month and clean or replace filters as necessary. Keeping the filter clean can lower your air conditioner’s energy consumption by 5% to 15%.
Occasionally pass a stiff wire through the unit’s drain channels. Clogged drain channels prevent a unit from reducing humidity, and the resulting excess moisture may discolor walls or carpet.
*In the winter, either cover your room air conditioner or remove and store it.
Air conditioning is not an exact science. There are many variables that can affect the way an air conditioning system performs. Also there are many factors that can affect the size of the air conditioner that you need. What I want to get into next is the problems that can show up from an air conditioning system being either too big or too small.
You have three estimates for central air conditioning in your house? Each estimate quotes you a different size unit. What do you do? Buy the middle one because they are between the other two? You may be happy and maybe not. Let me explain how this works and what the results are of not getting it right.
If the air conditioning unit is undersized, this is actually the lesser of the two evils. If your system is too small the worst that can happen is not nearly as bad. An air conditioning system that is too small will just not quite keep up on a very hot day. This usually is not that noticeable because as long as there is a difference between the inside and the outside temperatures you will still be happy. If the house is 80 degrees on a 95 degree day, you still feel rather cool in the house. The other advantages to the under sized air conditioning system is that you still get very good dehumidification on a mild rainy day when you still want some cooling and everyday that you are running the air conditioner you are saving money. Yes, even if the air conditioner is running longer, you are still saving money because it is using less power. The efficiency of the slightly undersized system will be much higher than the oversized system.
If your central air conditioning system is too big for the space being cooled you are actually worse off than if it was too small. Yes too large of a system creates some major problems! If your system has too much capacity and cools your house off too quickly, you will not get he secondary effect of that an air conditioner is designed to give you. The second benefit of your system is to dehumidify the air. If your system can cool the air very rapidly before it has time to take the water out of the air, you will not have a comfortable house. This also goes for any other building. Have you ever entered a store and it felt like you just walked into a refrigerator? That is because the equipment is so large that it is cooling the air, but not removing the water out of the air. The effect is a very uncomfortable cool. This can happen in homes, but usually to a lesser degree. The discomfort may not be that pronounced, but it will not be as comfortable as it could be.
So, as you can see size really does matter when it comes to air conditioning. The oversized system will give you an uncomfortable cool and waste energy at the same time. Neither of these things are something that you want. The undersized system may allow the temperature to creep up a bit on a very hot day, but will save energy and give great comfort most of the time. The ideal sizing is for the unit to be running constantly on the hottest day of the year and barely be able to keep up. When you are shopping for central air conditioning make sure that you tell the salesperson what you want and insist on seeing their heat loss/gain calculations for your building. No one can guess at what you need and do it correctly. Making sure you have the right central air conditioning for your house or building will make you comfortable and happy for many years to come!
The 'dry' setting is a feature which allows you to use the air conditioner as a dehumidifier. It works by cooling the radiator enough for it to attract condensation (mosture from the rooms air) which then drains into a tank or an external hose which dries the room. Even when used in cooling mode the unit will dehumidfy too, but because the fan is on it will be less effective. Also when the unit is in cooling mode it stops the compressor (cooling motor) when it reaches the selected rom temperature, however the dry function overides this and is a more effective dehumidifier as it will work in small spaces too. Hope this helps.