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How to design a DOAS unit as sole source heating and cooling

When possible, it makes life easy to have a separate DOAS system from the space HVAC system. In this case, each system has one specific job: -The DOAS’s job is...... Read More

DYK York doesn’t require suction traps for R410a?

When an HVAC system uses POE (Polyolester) oil, which is typical of current R410a systems, suction oil traps are not required* because POE is miscible in R410a in all phases...... Read More

Fan Types- Centrifugal, Axial, Forward Curve, Airfoil. What does it all mean?

The cfm Distributors Inc Applied Systems Group meets every other Monday at 8am for training. This training covers a plethora of topics, but a portion of this training is...... Read More

How to use Fan Laws for design/build retrofits

If you’ve ever had a situation where your HVAC unit had less airflow than expected, you’ve officially had a run-in with the FAN LAWS. The biggest takeaway from this...... Read More

How to Avoid a VRF Piping Nightmare

Refrigerant copper piping isn’t new. It’s been in use for years and has stood the test of time. What you might not know is how important the insulation can be. Check out...... Read More

How to Avoid a VRF Refrigerant Nightmare

If you haven’t designed a VRF system yet, you need to be aware of what code violations can get you into the most trouble. Check out this article to...... Read More

How to Avoid a VRF Zoning Nightmare

One of the biggest benefits of VRF is the built-in zoning that is available. But if you don’t design the system properly you can run into major problems. Check...... Read More

The 35% Rebate that no one is talking about

In case you missed it, effective January 1, 2018, via the Tax Cuts and Jobs Act Section 179, all components of an HVAC system can be expensed immediately instead of...... Read More

HVAC swimming pool design

Did you know that the HVAC equipment for indoor pool applications should not be installed directly above the swimming pool area? Warm moist air, which might contain airborne chemicals like...... Read More

How do you select and design a custom coil replacement?

Here is a step-by-step process for replacing a custom coil and A) Making sure it fits and B) Making sure it works.Step #1: Gather the physical coil dimensions (more info...... Read More

Can you mix R-410a and R-22 equipment?

“Can you install an R-410a condensing unit matched with an R-22 evaporator coil?”We get asked this question often, so we thought it would be helpful to write a post about...... Read More

How do you fix a humidity problem?

Humidity, the 8th wonder of the world, is a tough nut to crack. Unlike sensible heat transfer, it’s very difficult to measure its movement into buildings through cracks, doorways, and other openings.But,...... Read More

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