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How to Estimate a Custom Air Handler Change Out

Changing out a custom air handler may require a lot of attention to detail, but with the right checklist handy it should be no big deal! Here is a...... Read More

How to avoid a common chiller design mistake

We were recently called out to a job site visit because the commons area and hallways of a multi-million dollar condominium building had humidity issues.  These areas were being served by...... Read More

Did you know that Rawal valves can help fix humidity issues?

For this solution to be successful, you will need to REDUCE the system airflow in addition to installing the Rawal valve.  Lowering system airflow does TWO things: It lowers...... Read More

3 Ways to Measure Airflow for Rooftops and Other HVAC Equipment

One of the most common reasons for rooftop service calls is incorrect airflow.  Low airflow will often lead to frozen evaporator coils, low pressure trips, sweating ductwork and low...... Read More

Can you use a standard rooftop for a makeup air application?

We get asked this question often. And for good reason, DOAS equipment is expensive.  If a building owner needs makeup air, in most cases a DOAS will be required....... Read More

Did you know: Hot Gas Reheat provides NO benefit on a design day?

Did you know: hot gas reheat operation (for dehumidification) provides NO benefit on a summer design day? This can be an easy mistake to make. (to clarify from the start, this is NOT...... Read More

How to Calculate Cooling Capacity for a DOAS unit

This is an easy calculation if you know the cfm (airflow to be conditioned) and have a psychrometric chart handy.  The formula for calculating total cooling is: Qt = cfm x (Hf-Hi)...... Read More

HVAC Rules of Thumb

If you’ve been in the HVAC industry for a while, you probably have some “Rules of Thumb” that you use throughout your day. Here are a few that you...... Read More

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

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