Articles
Product guides, replacement advice, and part identification help for PTAC units, water source heat pumps, and McQuay / Daikin Applied equipment.
Zoneaire PTAC Replacement: The C and S Series and Every Brand Name They Wore
Hundreds of thousands of Zoneaire PTACs were sold under other brand names. The label on yours may not say Zoneaire.
42 x 16 Hydronic PTACs: Choosing Between the Applied Comfort NA, NF, and NY
Three Applied Comfort units fit the 42 x 16 sleeve with boiler heat. The cabinet top and where the coil sits decide which one you need.
Replacing Amana, Friedrich, and Other 42 x 16 PTACs
If the sleeve is 42 x 16, most brands are interchangeable. Five things still need checking before you order.
Hotpoint vs. GE Zoneline PTACs: What You Give Up and What You Save
Hotpoint PTACs come from GE Appliances and fit the same sleeve as Zoneline. The difference is what is left out.
GE Zoneline Vertical PTACs: Choosing Between the V10, V11, and V12
Vertical PTACs sit in a closet instead of a wall opening. GE builds three series. Here is how they differ.
What a Makeup Air PTAC Does, and When You Need One
A makeup air PTAC conditions and dehumidifies outdoor air at the room, which can replace a rooftop makeup air system.
GE Zoneline Features That Matter in Hotels: Sentinels, Temperature Limits, and Desk Control
Freeze Sentinel, Heat Sentinel, temperature limits, and desk control are settings, not add-ons. Here is what each one does and how hotels use them.
The RS Story: From the First Packaged Terminal Heat Pump to Today's Replacement
The RS started under the Remington name in the late 1970s. Its sleeve outlived three brand names and the end of McQuay PTAC production.
The 44-Inch PTAC Sleeve: Replacing McQuay EA, MEA, and PMES Units
Many hotels and office buildings have 44-inch sleeves from the McQuay EA era. A standard 42 x 16 unit will not fit them.
Replacing McQuay K, EK, MEK, and PKES PTACs
The McQuay K was three separate parts. Its replacement is one chassis that fits the same 36 x 13 opening.
Applied Comfort 16 Series: Replacing AAF Series 16 and Nelsonaire PTACs
The 16 Series fits two sleeve widths, one for electric heat and one for hydronic. Ordering the wrong sleeve is the most common mistake.
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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.