This photo is of a blower door test we performed at my own house using a Retrotec blower door. You will notice the 15-passenger van outside the window, which is a dead giveaway. A blower door is used to measure the tightness of a building and is often discussed in terms of an ACH50 number. […]

This tech tip was written by experienced tech and VRV specialist Ryan Findley. Thanks, Ryan. This is a quick overview, not a substitute for taking proper manufacturer training.   This tech tip is geared towards the mechanic who is fairly new to VRV systems. As with anything, before we harness the ability to install or […]

Net refrigeration effect (NRE) is the quantity of heat that each pound of the refrigerant absorbs in the refrigerated space to produce useful cooling. That’s a pretty vague definition. We know that it’s an amount of heat in processes that take place within the evaporator. Still, the phrase “useful cooling” seems rather broad. Even though […]