Articles
Product guides, replacement advice, and part identification help for PTAC units, water source heat pumps, and McQuay / Daikin Applied equipment.
R-454B and PTAC Replacement: What Changed and What Did Not
New PTACs moved to R-454B refrigerant. For replacement jobs, the change is mostly invisible, with a few things worth knowing.
GE Zoneline AZES vs. AZHS vs. AZVS: Which Series Fits Your Building
All three current GE Zoneline series fit the same 42 x 16 sleeve. The differences are in how they heat and what they cost to run.
Replacing PTACs on the 32 x 18-5/16 Sleeve with the Applied Comfort DM Series
Dozens of discontinued PTAC lines shared one 32-inch sleeve. Here is how the DMQE and DHE replace them without touching the wall.
How to Decode an Applied Comfort PTAC Model Number
One Applied Comfort model number tells you the series, heat type, size, voltage, heater, and cord. Here is how to read it.
Finding Parts for Discontinued McQuay PTACs and Equipment
McQuay PTAC production ended in 2014. Many parts did not. How to keep older McQuay and Singer units running, and when to replace.
The Applied Comfort PTAC Parts Most Often Replaced
Four Applied Comfort parts cover a large share of service calls. Here are the symptoms that point to each one.
Keeping AAF Herman Nelson Unit Ventilators Running: A Parts Guide for Schools
Many school unit ventilators are older than the people maintaining them. Here is how to find parts that fit.
Replacing Steam and Hot Water Coils in McQuay Equipment
Steam and hot water coils fail most often in a cold snap. A quick replacement starts with the model and serial number.
How to Order McQuay Chiller Parts the Right Way
For chiller parts, the serial number matters more than the model number. Here is what to send and which parts we supply.
McQuay Water Source Heat Pumps: Enfinity Horizontal, Vertical, and Console Units
McQuay builds water source heat pumps for ceilings, closets, and under windows. Here is how the Enfinity and console lines differ.
Islandaire PTAC Replacement and Parts: Matching Your Model to the Right Unit
Islandaire units come in several sizes, so there is no single replacement. The model letters point to the right Applied Comfort series.
Replacing Friedrich Climate Master 700 Series PTACs
The Climate Master 700 series used a 36 x 16 sleeve. A 42 x 16 unit will not fit it, but the Applied Comfort CM does.
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Latest Articles
All articlesR-454B and PTAC Replacement: What Changed and What Did Not
New PTACs moved to R-454B refrigerant. For replacement jobs, the change is mostly invisible, with a few things worth knowing.
GE Zoneline AZES vs. AZHS vs. AZVS: Which Series Fits Your Building
All three current GE Zoneline series fit the same 42 x 16 sleeve. The differences are in how they heat and what they cost to run.
Replacing PTACs on the 32 x 18-5/16 Sleeve with the Applied Comfort DM Series
Dozens of discontinued PTAC lines shared one 32-inch sleeve. Here is how the DMQE and DHE replace them without touching the wall.