The Basics: Air Conditioners Room air conditioner is an enclosed cooling unit that can be mounted in a window, through a wall or in a portable cabinet on a floor near a window. Its job is to cool the air in a small, confined area as directed by the unit's controls. Some room air conditioners have other functions as well. For example, reverse intake air conditioners also work as heaters, making them a home appliance that is useful nearly year-round. Room CASIO np-20 Battery air conditioners work similarly to central air conditioning systems, but are contained in one compact unit. When the room air conditioner unit is on, the condenser pulls in the refrigerant gas and pressurizes it, raising the temperature of the gas. The heated high-pressure gas then travels to the condenser coils on the outdoor side of the unit where fins distribute the collected heat. The cooled gas then condenses into a liquid that moves indoor to the evaporator coils where it absorbs heat from the room. A fan moves the air through the unit and expels the cooled air into the room. A thermostat controls the unit's operation. Many units now have advanced electronic controls that can adjust one degree at a time, rather than the primitive "cool" or "cooler" dial settings that were once common. The electronic controls also may regulate the fan speed, operation mode, timer and other settings. In addition, many air conditioners at a variety of price points now include a remote. An air conditioner unit's cooling power is measured in British Thermal Units or Btu per hour. One Btu can raise or lower the temperature of 1 pound of water 1 degree Fahrenheit. All room air conditioners are rated by the maximum Btu/hr. Keep in mind that even the smallest room air conditioners may have thousands of Btu per hour. To keep these numbers is the proper perspective, remember to compare the Btu between systems. Generally, the more Btu, the larger an area the air conditioner can cool. It is very important to understand the terms used in HP Compaq 6710b Battery air conditioners. BTU - The higher the BTU (British Thermal Units) count of the air conditioner the better will be the cooling capacity of the air conditioner. The cooling capacity is the ability to keep the room cool. A unit with high BTU can keep you cool even in extreme heat. It is important to match the BTU to the room size. EER - The ratio of air conditioner's cooling capacity to its power consumption is the unit's (EER). A system with higher unit is better for both you and your environment. Though these models are expensive, they save money in the long run by consuming less energy. Thermostat - This is responsible for the temperature of the air coming out of the unit. This is programmable or manual. AC units with remote controls are better since they offer more comfort and other controls like li-ion NP-60 Battery auto timer, digital display, etc. Filter - Filters clean the air passing through the unit. It is better and more comfortable if you choose the units with filters that can be easily cleaned. Fan - A variable speed fan is preferred since that gives better cooling. Units with louvers that adjust up/down and right/left are more user friendly and helps give uniform cooling. Chassis - The chassis is available in fixed and slide out types. Small units that are light in weight have fixed chassis, since it is easy to move them for winterization. Larger, heavier models have slide out chassis, this makes the unit slide out easily for maintenance. Factors to consider before making a purchase: There are innumerable variables to be considered before choosing a thinkpad r60 battery pack window AC. The number of windows, number of people occupying the room, the direction to which the room is facing, the ceiling height, etc. Size of the room: Depending on the size of the room the suitable unit with the suitable cooling capacity has to be chosen. The cooling capacity is measured in BTU/hr. Area of around 250 - 300sq ft will require unit with 7000 BTU/hr. The popular belief that bigger is better is wrong in this case. A larger unit will consume a lot of energy and exert unnecessary load on its components. Measurement of the window: Generally window ACs are designed to fit double hung windows. You should take the exact measurement of the inside dimensions of the lower part of your window, to help you finalize on the size of the unit should buy. An estimate of the dimensions will not be helpful enough to decide on the air conditioner unit you need to buy. The power supply: The type of plug of the unit and the socket in your wall has to be considered. You should make sure that the power supply of the place where you wish to install the unit is capable enough to handle the unit. Generally the small np-60 battery units work with 115 - volt outlet, while the larger ones need a dedicated circuit for themselves. Weight: The weight of the unit should also be taken into consideration. You should ensure that the window has the capability to support the unit. Noise: The newer units are quieter than the older models; however you should know that these units do make noise when switched on. Installation: The unit has to be stable when being installed. It has to be tightly sealed in order to keep its cooling effect inside; right where it is supposed to be. In order to improve the efficiency of the performance, it is better to keep the unit in a window where there is shade. Maintenance: Any problem with the air conditioner is avoidable by simple maintenance of the unit. Make sure to keep the filter and the coils clean or to replace them at the right time as directed by the manufacturer. Here are five key questions to answer before you purchase an air conditioner: How big is the area you want to cool? Room pavilion dv6000 battery air conditioners are rated in Btu capacity. For a small room (100 to 300 square feet), select an air conditioner of 5,000 to 6,000 Btu/hr. For a medium-size room (300 to 600 square feet) choose a unit of 8,000 to 9,000 Btu/hr. For larger rooms (600 to 1,000 square feet) the best choice is an air conditioner of 10,000 to 15,000 Btu/hr. These are guidelines. If the insulation in your home is minimal or the air conditioner sits in a hot south-facing window, opt for a unit with higher Btu. Also remember that these calculations are for standard room heights; if the room you are cooling has a taller ceiling, you'll need about 10 percent more Btu to adequately cool the air in the room. If possible, avoid installing the cooling unit in a south-facing window that gets lots of sunlight as it reduces the unit's efficiency. Keep in mind that if you buy an air conditioner with a higher Btu rating than you really need, it will cycle on and off too quickly. This means it will use more energy, cost more to operate and remove less humidity from the air. Alternatively, if you use an air conditioner with a low Btu to cool a too-large room, it will run continuously and cost more to operate. Where is the best place to install an air conditioner? Many room air conditioners are installed seasonally in a window. Most residential windows open from the bottom and the majority of room air conditioners are designed to be placed on the sill with accordion-like extension panels that seal the opening and help prevent air loss. Some models are built for installation in side-sliding windows with an extension panel above the unit. Alternately, air conditioners can be installed more permanently through the wall to make a better seal and offer firmer support than a window. Another option is a portable air conditioner, which are enclosed in a rolling cabinet. Some vent the heat through a duct that can be placed in a nearby window; other portables use water from the dehumidifying process to cool the air. Can an air conditioner do more than just cool a room? Yes, some also act as dehumidifiers and some do double-duty as heaters. Depending on where you live, humidity may be a problem or a necessity. For arid summer climates, an ibm thinkpad r60 battery power air conditioner with a built-in humidifier can add moisture to the air to make the room more comfortable. For other areas, hot days are exacerbated by humidity. An air conditioner with built-in dehumidifier can remove moisture from the air. Some models can also serve as heaters to warm the air as needed. This means that they can stay in place year-round and serve multiple purposes. How important are controls? Older room air conditioners were controlled by a single dial that was set based on an estimate of the result: Set it most of the way to the left, for example, to keep the room at about 72 degrees Fahrenheit. Today's air conditioners are much smarter; you can set a unit for 72 degrees and it will maintain the air temperature within 1 degree of that point. For convenience, many room air conditioners now have wireless remote controls that let you change settings -- even the direction of the airflow -- from across the room. Many units have timers to program the unit to start or shut off, so you can set the AC to turn on just before you get home or turn off when you go to sleep. An important feature of most room air conditioners is the filtration system. Nearly all units have a cleanable foam filter. Some use electronic air filtration to remove dust and pollens from the air. Make sure that the filtration system is adequate and easy to maintain. It's important to check that extra features, such as a heater or dehumidifier, have adequate and easy-to-use controls. Also, be sure that there is an electrical unit near where you will use the unit. Most models run on standard three-prong 115-volt plugs. What is your cooling budget? How much can you invest in cooling a room? If the selected room only gets hot during a couple of weeks in the summer, you probably want to invest in a less expensive model. If the cooling season is long and the room is frequently populated, you should invest in a more expensive and more powerful unit. Here are some Dell Studio 1535 battery guidelines: Room air conditioners range from $100 to $1,500 with most of them in the range of $250-$600. Lower priced models often have manual controls and higher priced units may include a dehumidifier or a heater. For about $350, you'll get an energy-efficient 8,000 to 10,000 Btu air conditioner with adequate features and a remote control, which is just right for many applications.