Most of us are not in the heating and air conditioning business and probably only pay close attention to our HVAC systems when something goes wrong. At this point, when a contractor is in your home talking about the pros and cons of several potential units, it becomes clear almost immediately that the language specific to the cooling and heating industry is unique. Taking the time to understand HVAC language can make a big difference when it's time to buy a new system. This is a unit rating that is regulated by the government. stands for Seasonal Energy Efficiency Rating and involves a complex calculation to arrive at an energy efficiency rating based on a season of use. The current minimum for new equipment is 13, while it is possible to find a number of systems rated above 20.. or energy efficiency rating, is a similar calculation. However, instead of factoring in a chill season with a few hot days and a few mild days, calculate a score based on a peak chill day. Compressor, condenser coil. The compressor is located outside and pumps refrigerant as needed to cool the house. The condenser coil receives high pressure refrigerant from the compressor and releases heat to the outdoors. This allows the refrigerant to cool, at which point it returns inside through the condenser coil. The spool works most efficiently when it is clean. A dirty coil can increase the energy consumption of an HVAC system by up to 30 percent, according to the Department of Energy.Reimbursement calculations. This is exactly what it sounds like and is information that any worthy HVAC contractor can offer a homeowner. The contractor should be able to explain the recovery calculations for any unit he recommends. Estimates of the energy cost you should expect to pay are based on the regional cooling load, the cooling capacity of all units considered, and the current cost of the various types of energy. Calculating ROI is one way to compare different HVAC systems against each other. Programmable thermostat With a programmable thermostat, it is possible to change the settings during the day - when you may not be at home - so that the system is more energy efficient. Some programmable thermostats will work with the internet so you can use a computer or cell phone to change settings even if you forgot to do so after you depart on your trip. If a system is 1 ton, that's 12,000 Btu of cooling per hour One tonne can be expected to cool between 400 and 700 square feet of living space. Air filters are essential to your air conditioning system. They remove particles from the air, keep the system clean, help it run efficiently, and improve indoor air quality. They can also impede airflow, reduce efficiency, increase energy costs, and in extreme cases, cause evaporator coils to freeze, so it's important to choose them carefully. To select the right filter, focus on three key factors: size, filtration and air flow. Dimensions The dimensions of the air filter are expressed in length x width x depth. To determine the correct size, refer to the dimensions printed on the installed filter, consult your equipment manual, or consult your installer. While most filters are 1 or 2 inches deep, specialty and custom filters can be 6 inches or more deep. Unless your air conditioning unit is designed for an ultra-deep filter, stick to the standard depths. Filtration The filtering capacity is described numerically, using a number of minimum efficiency ratio values The smaller the pores, the more effectively the filter removes airborne particles. Are you trying to decipher the technical information you have read or heard? These nine common acronyms and abbreviations can help you crack the code: Ac stands for British Thermal Unit, a standardized measure for heat production. One is equal to the amount of heat required to raise the water temperature by one degree F. In cooling, the rating indicates the capacity of a system, so the higher the number of , the more the system is. powerful. AC stands for Celsius, an alternative method of measuring temperature. Designed by Swedish astronomer Anders Celsius in 1742, the system was based on a 100-degree scale. Anders designated zero as the boiling point and 100 as the freezing point, but the modern system reverses the numbers: zero indicates the freezing point of water and 100 indicates the boiling point. In the United States, most descriptions use Fahrenheit, but some technical descriptions use Celsius. stands for cubic feet per minute, a measure of air flow. indicates the volume of air that in one minute moves through ducts and into the living space. High numbers indicate more air movement and low numbers reflect less air movement.