Window or Room AC Buying Tips

Buying guide for window type air conditioner:

Now a day’s people are seeking to more energy efficient home appliances as the demand of energy is increasing. In this respect people are preferring window air conditioner than their central air conditioner due to its energy saving property.

Most window air conditioner is installed vertically in the room wall. Sometimes it is installed in windows with some modification. Like all other air conditioner window air conditioner has the parts named a compressor, a condenser, an evaporator, an expansion valve, a filter, a thermostat and a control panel. The working principle is also same like other conventional air conditioner like portable or central air conditioner.

Efficiency evaluation:

If you need to cool two or three rooms then you should definitely go for a window air conditioner. Because the initial cost of window air conditioner is low and is usable to long time with less maintenance cost. To buying an energy efficient room air conditioner you have to be familiar with a term called EER. EER may be defined as how many BTUs are required to cool a room using one watt of electricity. So everyone should buy room air conditioner having higher EER. The higher the EER value the higher the energy efficiency of the air conditioner.

While choosing a room air conditioner you must have to meet the exact amount of BTUs for the required space. If BTUs become more then the required amount then your cooling space will be dummy. On the other hand if BTUs become less then the required amount then the air conditioner will loss more electricity to cool the space and work overtime. So its an important factor to be considered while buying a room air conditioner.

Can really a portable Air Conditioner Save Money?

Yes definetely, a portable air conditioner can save money because of following reasons:

• Portable air conditioners are freestanding mobile air cooling units and need simple installation that costs much less as compared to window or split AC.
• Portable air conditioners are energy efficient and save money on your electric bill.
• Portable air conditioners are very easy to install and do not require money to changes your home interior.
• Portable air conditioners need less repairing and maintenance and saves money.

Portable Free Standing Air Conditioner

The demand of portable air conditioner's demand is increasing day by day.Air conditioning is demand of a hot and humid summer day. In addition to cooling, air conditioners also dehumidify and filter air, making it more comfortable and cleaner. Portable air conditioners also referred to as mobile air conditioner, have gained popularity over recent years.
There are many factors why portable air conditioners are in great demand:
A portable air conditioner is small and mobile and can be carried anywhere.

• A portable air conditioner is not a through the wall AC unit and can be placed or installed anywhere.
• A portable room air conditioner is a small free standing room air conditioner and is easier to maintain.
• A portable air conditioner can be easily stores when not needed.

Installation and Location of Air Conditioners

If your air conditioner is installed correctly, or if major installation problems are found and fixed, it will perform efficiently for years with only minor routine maintenance. However, many air conditioners are not installed correctly. As an unfortunate result, modern energy-efficient air conditioners can perform almost as poorly as older inefficient models.

Be sure that your contractor performs the following procedures when installing a new central air conditioning system:

• Allows adequate indoor space for the installation, maintenance, and repair of the new system, and installs an access door in the furnace or duct to provide a way to clean the evaporator coil

• Uses a duct-sizing methodology such as the Air Conditioning Contractors of America (ACCA) Manual D

• Ensures there are enough supply registers to deliver cool air and enough return air registers to carry warm house air back to the air conditioner

• Installs duct work within the conditioned space, not in the attic, wherever possible

• Seals all ducts with duct mastic and heavily insulates attic ducts

• Locates the condensing unit where its noise will not keep you or your neighbors awake at night, if possible

• Locates the condensing unit where no nearby objects will block the flow of air to it

• Places the condensing unit in a shady spot, if possible, which can reduce your air conditioning costs by 1%–2%

• Verifies that the newly installed air conditioner has the exact refrigerant charge and air flow rate specified by the manufacturer

• Locates the thermostat away from heat sources, such as windows or supply registers.

If you are replacing an older or failed split system, be sure that the evaporator coil is replaced with a new one that exactly matches the condenser coil in the new condensing unit. (The air conditioner's efficiency will likely not improve if the existing evaporator coil is left in place; in fact, the old coil could cause the new compressor to fail prematurely.)

An Efficient Central Air Conditioners

Central Air Conditioners

Central air conditioners circulate cool air through a system of supply and return ducts. Supply ducts and registers (i.e., openings in the walls, floors, or ceilings covered by grills) carry cooled air from the air conditioner to the home. This cooled air becomes warmer as it circulates through the home; then it flows back to the central air conditioner through return ducts and registers.

Air conditioners help to dehumidify the incoming air, but in extremely humid climates or in cases where the air conditioner is oversized, it may not achieve a low humidity. Running a dehumidifier in your air conditioned home will increase your energy use, both for the dehumidifier itself and because the air conditioner will require more energy to cool your house. A preferable alternative is a dehumidifying pipes, which can be added as a retrofit to most existing systems.
Types of Various Central Air Conditioners

A central air conditioner is of two types.They are either a split-system unit or a packaged unit.

In a split-system central air conditioner, an outdoor metal cabinet contains the condenser and compressor, and an indoor cabinet contains the evaporator. In many split-system air conditioners, this indoor cabinet also contains a furnace or the indoor part of a heat pump. The air conditioner's evaporator coil is installed in the cabinet or main supply duct of this furnace or heat pump. If your home already has a furnace but no air conditioner, a split-system is the most economical central air conditioner to install.

In a packaged central air conditioner, the evaporator, condenser, and compressor are all located in one cabinet, which usually is placed on a roof or on a concrete slab next to the house's foundation. This type of air conditioner also is used in small commercial buildings. Air supply and return ducts come from indoors through the home's exterior wall or roof to connect with the packaged air conditioner, which is usually located outdoors. Packaged air conditioners often include electric heating coils or a natural gas furnace. This combination of air conditioner and central heater eliminates the need for a separate furnace indoors.
Choosing or Improving Your Own Central Air Conditioner

Central air conditioners are more efficient than room air conditioners. In addition, they are out of the way, quiet, and convenient to operate. To save energy and money, you should try to buy an energy-efficient air conditioner and reduce your central air conditioner's energy use. In an average air-conditioned home, air conditioning consumes more than 2000 kilowatt-hours of electricity per year, causing power plants to emit about 3500 pounds of carbon dioxide and 31 pounds of sulfur dioxide.

If you are considering adding central air conditioning to your home, the deciding factor may be the need for ductwork. See the section on limitations when replacing existing systems for more information.

If you have an older central air conditioner, you might choose to replace the outdoor compressor with a modern, high-efficiency unit. If you do so, consult a local heating and cooling contractor to assure that the new compressor is properly matched to the indoor unit. However, considering recent changes in refrigerants and air conditioning designs, it might be wiser to replace the entire system.

Today's best air conditioners use 30%–50% less energy to produce the same amount of cooling as air conditioners made in the mid 1970s. Even if your air conditioner is only 10 years old, you may save 20%–40% of your cooling energy costs by replacing it with a newer, more efficient model.

Proper sizing and installation are key elements in determining air conditioner efficiency. Too large a unit will not adequately remove humidity. Too small a unit will not be able to attain a comfortable temperature on the hottest days. Improper unit location, lack of insulation, and improper duct installation can greatly diminish efficiency.

When buying an air conditioner, look for a model with a high efficiency. Central air conditioners are rated according to their seasonal energy efficiency ratio (SEER). SEER indicates the relative amount of energy needed to provide a specific cooling output. Many older systems have SEER ratings of 6 or less. The minimum SEER allowed today is 13. Look for the ENERGY STAR® label for central air conditioners with SEER ratings of 13 or greater, but consider using air conditioning equipment with higher SEER ratings for greater savings.

New residential central air conditioner standards went into effect on January 23, 2006. Air conditioners manufactured after January 26, 2006 must achieve a Seasonal Energy Efficiency Ratio (SEER) of 13 or higher. SEER 13 is 30% more efficient than the previous minimum SEER of 10. The standard applies only to appliances manufactured after January 23, 2006. Equipment with a rating less than SEER 13 manufactured before this date may still be sold and installed.

The average homeowner will remain unaffected by this standard change for some time to come. The standards do not require you to change your existing central air conditioning units, and replacement parts and services should still be available for your home's systems. The "lifespan" of a central air conditioner is about 15 to 20 years. Manufacturers typically continue to support existing equipment by making replacement parts available and honoring maintenance contracts after the new standard goes into effect.

Other Features to Look For When Buying an Air Conditioner:

A thermal expansion valve and a high-temperature rating (EER) greater than 11.6, for high-efficiency operation when the weather is at its hottest

A variable speed air handler for new ventilation systems

A unit that operates quietly

A fan-only switch, so you can use the unit for nighttime ventilation to substantially reduce air-conditioning costs

A filter check light to remind you to check the filter after a predetermined number of operating hours

An automatic-delay fan switch to turn off the fan a few minutes after the compressor turns off.