The HVAC industry measures the capacity of heating and cooling systems with many different terms. This page presents and defines the most commonly used terms. A BTU is the quantity of heat required to raise 1 pound of water by 1 degree Fahrenheit. Air conditioner cooling capacity is often measured in either BTUH or tons. 1 ton = 12,000 BTUH. A furnace's output can be measured in several ways. One of those measures is the volume of air that passes out of the furnace and into the ductwork over a predefined span of time. This is a furnace's indoor blower capacity and it is measured in cubic feet per minute (cfm). You may see documentation that refers to the "maximum" capacity as compared to the "default" capacity. The maximum indoor blower capacity represents the furnace's highest setting. The default capacity is the factory setting at the time that the furnace A second and related measure is the amount of heat created by the furnace, measured as British Thermal Units (BTUs) or

The number of British Thermal Units per hour that the furnace or boiler consumes when running at a steady state. when it has finished startup and is running at full power.) Boilers with an input BTUh greater than 350,000 are typically considered commercial boilers. A ton of cooling capacity is the amount of cooling that would be provided by melting a ton of ice. Thus, a central air conditioning system that is rated as a 2-ton system would provide the same cooling as melting two tons of ice per day (24-hour period). A ton is equal to 12,000 BTUs. Thus, a 2-ton air conditioner is equivalent to a 24,000 BTU air conditioner. Technically speaking, voltage is the rate at which energy is drawn from an electricity source. A simple analogy is that voltage can be likened to the pressure of water in a pipe. Voltage is measured in volts. Motors are designed to operate with electrical input within a certain range of voltage. If the electrical input source provides electricity at a voltage outside

the specified range, performance is likely to be sub-optimal. The unit of electrical power equal to 1 ampere (amp) under a pressure of 1 volt. Equal to 1/746 horsepower. An electrical energy unit of measure equal to 1 watt of power supplied to, or taken from, an electric circuit steadily for 1 hour. A unit of work or energy, measured as 1,000 watts (1 kilowatt) of power expended for 1 hour. goodman ac unit partsOnce generated, one kWh is equivalent to 3,412 Btu.liquid nitrogen ac unitHome Live City Services Utilities Ways to Save Home$ave Rebate Program High-Efficiency Central AC Unitsfree ac units for low income High-Efficiency Central AC Units According to ENERGYSTAR®, your home’s central heating, ventilation and air conditioning (HVAC) system is responsible for nearly 50 percent of the energy consumed in your home.

If your home's central air conditioning unit is not working properly or is 10 - 15 years old and you are shopping for a new model, Danville Utilities Home$ave is offering big rebates to make purchasing a more efficient central AC system easier. Residential electric customers are eligible for a $145 or $250 mail-in rebate, depending on the SEER and EER ratings for each High-Efficiency Central Air Conditioner purchased by submitting a Rebate Application with required proof of purchase and equipment specifications. ENERGY STAR qualified central air conditioners have higher SEER (Seasonal Energy Efficiency Ratio) and EER (Energy Efficiency Ratio) ratings than today’s standard models. SEER is the most commonly used measurement of efficiency for air conditioners. It measures how efficiently a cooling system will operate over an entire season. EER measures how efficiently a cooling system will operate when the outdoor temperature is at a specific level (95 degrees F). Rebates are available for qualifying central air conditioners, split systems or single package units (including gas/electric package units).

Equipment Eligibility & Rebate Level: Units must have a cooling capacity of ≥ 18,000 BTU/h. Tier 1 High-Efficiency Central Split System Air Conditioners must meet or exceed 15 SEER and 12 EER and Tier 1 High Efficiency Single Package equipment (including gas/electric package units) must meet or exceed 15 SEER and 11 EER as determined by Air Conditioning, Heating, and Refrigeration Institute (AHRI) Standard 210/240 (formerly ARI Standard 210/240). Equipment must be a newly purchased and installed air-source split or packaged unitary air conditioner. Split system equipment must include a new matched condensing unit and a new evaporator coil. To be eligible for a rebate, the installation must be a properly matched, complete system recognized by AHRI (Air Conditioning, Heating, and Refrigeration Institute) and have an official AHRI rating. Systems that do not have an AHRI rating will not qualify for the rebate since the efficiency cannot be verified by a standardized method. Both split systems and package systems are eligible.

Room Air Conditioners and Central Air Conditioners that use a third party (or independent) coil, three-phase equipment, and products rated above 65,000 Btu/hr are not eligible for rebates. The rebate for Tier 1 High-Efficiency Central Air Conditioners is $145 per unit. Units must have a cooling capacity of ≥ 18,000 BTU/h. Tier 2 High-Efficiency Central Air Conditioners must meet or exceed 16 SEER and 12 EER as determined by Air Conditioning, Heating, and Refrigeration Institute (AHRI) Standard 210/240 (formerly ARI Standard 210/240). The rebate for Tier 2 High-Efficiency Central Air Conditioners is $250 per unit. High-efficiency central AC units that replace an existing unit as well as new construction or first time installations are eligible for a rebate through a post-purchase application process. Home$ave rebate applications are valid for 90 days after product purchase. After 90 days, the equipment is no longer eligible for rebates from Danville Utilities. Download Home$ave Rebate Application