In the Energy Star certification program for room air conditioners, there is Section 3: Core Qualification Criteria that states: “CEER shall be greater than or equal to the Minimum CEER (CEERmin) as calculated per Equation 2.” If you open a window AC unit’s specification sheet, you will likely see the CEER rating between 8-15. Here … Read more
Kilowatt to horsepower conversion is one of the most common ones. Here’s how you can convert kW to HP: 1 kW = 1.341 HP The easiest way to remember the kW to HP conversion formula is to remember how many kilowatts is 1 horsepower of energy: 1 HP = 3/4 kW We’ll convert kW to … Read more
CFM or Cubic Feet per Minute is a unit for airflow we use in HVAC calculation. Most commonly, we need to calculate CFM for a room for fans, air purifiers, air conditioners, and so on. Example of a question LearnMetrics’s received: We have a 300 square foot standard bedroom. How much CFM should a fan … Read more
kVA (kiloVolt-Ampere) is a compounded unit. It’s comprised of both electrical potential (Volts) and electrical current (Amps). 1 kVA is a frequently used unit; it represents 1,000 Volt-Amperes. In many cases, it’s useful to convert kVA to amps. The most common question here is ‘How many amps is x kVA’. To calculate the amps, we … Read more
One of the most frequently needed electricity conversions is kW (kilowatts) to Amps. kW is a unit of measure of electrical power (wattage). Ampere (A) is a unit of measure of electrical current (amperage). To convert kW to Amps, we can use the equation for electrical power: Power (kW) = I (A) * V (V) … Read more
AFUE rating stands for ‘Annual Fuel Utilization Efficiency’. This is a key energy-efficiency rating for furnaces, and it’s most commonly used when evaluating the energy efficiency of gas furnaces. In the most basic sense, the AFUE rating tells us what percentage of fuel (natural gas, propane, oil) is converted into heat. Here are two examples … Read more
In the world of HVAC, heating and cooling device capacity is given in either: BTU (British Thermal Units) or, Tons. Converting BTU to tons is very easy. Here is a handy calculator you can use: Convert BTU To Tons Calculator With the calculator, you can convert obscure BTUs to tons. For example, how many … Read more
When it comes to heating devices, there is no single specification more important than the HSPF rating. HSPF rating is the key metric for all heating devices; be it heat pumps, furnaces, or water heaters. Understanding it gives you the fundamental insight into all heating devices. In fact, it’s so important that every larger heating … Read more
The SEER rating is a universal rating to determine the energy efficiency of air conditioners. SEER stands for ‘Seasonal Energy Efficiency Ratio‘; this is the key metric to determine how much electricity our AC unit will draw. A large number of AC units have either 14 SEER or 16 SEER. When figuring out which unit … Read more
Example: An air conditioner is powered by 900 Watts. How many Amps is that? It’s 7.5 Amps. To convert electrical power to electrical current (Watts to Amps), we need to use the electrical power equation: P = I*V where: P is electrical power, measured in Watts (W) I is electrical current or amperage, measured in … Read more