Psychrometric Calculator: Master Air Properties in Seconds (Free Tool) You are an HVAC engineer. You need to know the enthalpy of air at 75°F and 50% RH. Or you are a technician troubleshooting a humidity problem. You need to find the dew point. Psychrometrics is the study of moist air … Read more
Cooling Degree Days Calculator: You look at your summer electricity bill. It is high. You wonder why. Is it because of a hot summer? Is your AC inefficient? Or is your house poorly insulated? Cooling Degree Days (CDD) is the standard measure of how much cooling your home needs. It … Read more
Heating Degree Days Calculator – Estimate Your Heating Needs (Free Tool) . You look at your heating bill. It is high. You wonder why. Is it because of a cold winter? Is your furnace inefficient? Or is your house poorly insulated? Heating Degree Days (HDD) is the standard measure of … Read more
AC Replacement Payback Calculator – Find Your Break-Even Point (Free Tool) . Your air conditioner is old. It struggles to keep your home cool. Your electric bills are climbing. You know you need a new one. But the quote is $8,000. How long will it take to pay for itself? … Read more
HVAC Energy Savings Calculator: See How Much You Can Save (Free Tool) Your air conditioner or heat pump is probably the biggest energy user in your home. It can account for nearly half of your summer electricity bill. If your system is old or inefficient, you are throwing money away. … Read more
Disconnect Size Calculator: Find the Right Safety Switch (Free Tool) You are installing a new motor or air conditioner. You need a disconnect switch. But what size do you need? Too small, and it will not handle the load. Too large, and you are wasting money. A disconnect switch is … Read more
Motor FLA Calculator: Find Full Load Amps for Any Motor (Free Tool) You are sizing a circuit breaker for a new motor. You need to know the full load amperage (FLA). The nameplate says 10 HP. The voltage is 460V. But what is the FLA? You need this number for … Read more
VFD Speed Calculator: Optimize Your Motor Speed (Free Tool) You have a motor. You have a Variable Frequency Drive (VFD). You want to change the motor speed. How do you know what speed you are getting? The relationship between frequency and motor speed is direct. A VFD adjusts the frequency … Read more
Capacitor Calculator HVAC: Size Start & Run Capacitors Correctly (Free Tool) You are working on an air conditioner. The compressor won’t start. The fan motor hums but doesn’t spin. You suspect a bad capacitor. Or maybe you are replacing a capacitor and need to know the correct size. Capacitors are … Read more
Breaker Size for AC Unit: Find the Right Circuit Breaker (Free Tool) You are installing a new air conditioner. You have the unit. You have the wire. But what size breaker do you need? Too small, and it will trip every time the compressor starts. Too large, and the wire … Read more
