Cost Expectations & Comparisons

One Btu is equivalent to the heat generated by a single birthday candle. One ton of cooling is the rate of heat transfer needed to freeze 2, lbs — or one ton — of water in 24 hours. In some cases, bigger is better. This is certainly true of meal sizes, lottery winnings, and discounts.

But when it comes to air conditioners, sometimes less is more.

How to Check AC Freon Level

You should never simply buy the biggest AC unit possible, or you could end up with an oversized system. Here are the problems associated with oversized air conditioners:. The easiest place to look is on the AC unit itself. Go outside to the condensing unit and look for a data plaque mounted to the side. Find the model number. Within this string of letters and numerals, you should find an even, two-digit number.

The possibilities on residential units range from 18 to After all:. Therefore, while finding the tonnage of your AC unit is a useful place to start, you should still have your replacement air conditioner professionally sized before making your purchase. Get the most out of your upcoming investment — call Aire Serv for helping with sizing your new air conditioner. Open Accessibility Menu. Other Services. About Aire Serv. Brands We Service.

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Coleman Air Conditioners Reviewed

However, hydrocarbon refrigerants are NOT drop-in alternatives for most fluorocarbon refrigerants due to substantial system changes needed to manage their differing characteristics e. Duct Ducts are used in heating, ventilation, and air conditioning HVAC to deliver and remove air including supply air, return air, and exhaust air. Also see EC Fan upgrades. Economiser An economiser is a mechanical device used to reduce energy consumption. Economisers recycle energy produced within a system or optimise environmental temperature differences to achieve efficiency improvements.


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It is a ratio calculated by dividing the cooling capacity in kW by the power input in kW. Also see Electronic Expansion Valves. It provides businesses with enhanced tax relief for investments in equipment that meets published energy-saving criteria. Sometimes called total heat and heat content. Energy Reuse Effectiveness ERE Is the ratio of energy emitted from the data centre and reused elsewhere to total energy consumed. It is found by diving the amount of energy reused by the amount of energy consumed by the data centre overall.

Energy Reuse Factor ERF Is the ratio of the data centre energy that is reused elsewhere in the facility and the total energy brought into the datacenter control volume including IT, cooling, power, lighting etc. Evaporator coil An evaporator coil is usually located indoors as part of a split unit or within an air handler or duct system.

Inside the coil, refrigerant evaporates as it absorbs heat from the air that passes over it. Evaporating temperature The temperature at which a given refrigerant vaporises within an evaporator. Expansion valve A device that regulates the amount of refrigerant flowing from the liquid line into the evaporator. Can be a thermostatically operated valve, a capillary tube or a fixed orifice device. It forms part of a larger HVAC system found in residential, commercial , and industrial buildings.

How Do I Find the Tonnage of My AC Unit?

These were produced in response to the need to eliminate ozone depleting gases. Impacts the use of fluorine based refrigerants. Regulation leads to record keeping, leak detection and competence levels for engineers. See F Gas Compliance. Filter-Drier A device within a refrigeration system normally containing a desiccant designed to remove H2O.

Fluorocarbon A chemical containing fluorine and carbon. Footprint The area or space that an air conditioning unit takes up when applied. Free Cooling This may apply to a system using fresh air for cooling the space or a water cooled or glycol cooled system with an additional coil that provides chilled water cooling when the outdoor ambient is cold; thereby reducing or eliminating compressor operation. See our Free Cooling page for more information. Gauge pressure The reading taken from a gauge normally zeroed at atmospheric pressure one bar absolute or Barg, Psig.

Glide The different boiling temperatures of the various components of a refrigerant blend, leading to a change in the relative components of the blend across a temperature range. Typically, the glycol-cooled condenser is located inside the air conditioner with the rest of the refrigeration components. The glycol keeps the solution from freezing during winter operation. HCFC Hydrochlorofluorocarbon e.

R22 , lower ozone depleting, global warming gases. Heat capacity The amount of heat needed to raise the temperature of a given mass by 1 degree Kelvin.

Heat exchanger A heat exchanger is a piece of equipment built for efficient heat transfer between two physically separated fluids. Heat pump A heat pump is a mechanical device that absorbs low grade heat from a lower temperature location and upgrades and transfers the resultant higher temperature medium, created by mechanical work, to heat a space to a sufficient comfort level.

Heat pumps may be air to air, air to water, water to water or ground to water. Heat transfer Heat transfer describes the exchange of thermal energy between two interacting media passing through a heat exchanger, such as refrigerants, air and water. Hemi-anechoic chamber A room designed to completely absorb reflections of either sound or electromagnetic waves.

Hemi-anechoic chambers have a solid floor that acts as a work surface for supporting heavy items such as large air conditioning units for testing sound levels. Also see Test chamber 4 - Hemi-anechoic chamber. HFC Hydrofluorocarbon e. Ra , zero ODP, high global warming refrigerant gas. HFO Hydrofluoroolefin e.

Rze , zero ODP, low global warming, 4th generation refrigerant gas. High Performance Computing HPC High Performance Computing refers to the practice of aggregating computing power in a way that delivers much higher performance than one could get out of a typical desktop computer or workstation in order to solve large problems in science, engineering, or business. Hot aisle A hot aisle is a layout design for server racks and other computing equipment in a data centre. Hot aisle data centre design involves lining up server racks in alternating rows with cold air intakes facing one way and hot air exhausts facing the other.

The rows the heated exhausts pour into are called hot aisles. Humidification The process of adding moisture to the air within a space.

Its goal is to provide thermal comfort and acceptable indoor air quality. Inverter compressor This type of compressor uses an inverter drive to control the compressor motor speed to modulate capacity as demand varies. Kilowatt kW Measure of energy flow used to express the cooling capacity, heating capacity and power consumption of an air conditioning system.

Kyoto Protocol International agreement to regulate global warming signed in Kyoto Japan. This sets out goals for reducing greenhouse gas emissions thought to be responsible for global warming. Likely to be the framework for further HFC usage restrictions. Latent Cooling Capacity The amount of energy added or removed from the air in order to increase or reduce the moisture content of the air during the air conditioning process.

Low pressure stage The part of a single stage refrigerant system from the outlet of the expansion device to the compressor suction inlet. On a multi-stage system it is the part where the lowest temperature is achieved. MUA may be heated or cooled so that the air coming in does not have a major impact on the building air conditioning systems, but is not designed to cool or heat the building.

Microchannel coil The Microchannel coil design is based on technology from the automotive industry. It is constructed of parallel flow aluminium tubes that are mechanically brazed to enhanced aluminium fins, resulting in better heat transfer and a smaller, lighter, corrosion resistant coil. Natural refrigerant Non fluorochemical refrigerants, such as ammonia R , carbon dioxide R and hydrocarbons such as propane R or isobutene Ra. These products exist naturally in the environment.

However it should be noted that commercial production of natural refrigerants is normally via man-made synthesis. Near azeotrope This chemical product is formed by combining two or more compounds. Its vapour and liquid compositions are nearly identical. Non-condensable gas A gas in a refrigeration system that does not condense at the temperature and partial pressure that exists in the condenser, therefore leading to a higher head pressure.