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Fred Weldin


I can't help you if your whatsis won't work, people (Especially if it's a refrigerator); I have no experience with appliances, and I haven't been involved with H&AC service and repair since March 08, 1996 (Thank the Lord); I always send a "standard" reply to appliance questions and H&AC "Service and Repair" questions (about 20 a month), so if you want to know why your whatsis isn't working like it used to, ask someone else. A lot of my answers arenít read by the questioners; in that event, I always send reminders to read the answers for a month or more (the word "idiots" comes to mind - actually there's another more appropriate word, but discretion prevents its use here). If you have questions about how big a unit you need, if one room's warmer than the others, if you want an opinion oas to scope of work on bids received, etc. just ask. Do visit www.askweldin.com, there's a lot of good information on sizing, ductwork, efficiency, as well as some techniques accomplished DIY-ers can use to troubleshoot and improve their H&AC. Finally, I want to thank all of the kind, serious people whom I meet here: I enjoy working with you. My wife says I'm "snarky" from time to time; as for you others, please use your imagination as to the responses swirling on the snarky side of my brain when I read your questions.

Experience in the area

53 years in the business. See www.askweldin.com




B of ME U of D 1965, numerous classes, seminars and a lot of "Hands On" learning since.

What do you like about this subject?

Helping homeowners who've gotten a raw deal. Really.

What do you still hope to achieve/learn in this field?

I would love to be put out of work because the industry cleans up its act.

Something interesting about this subject that others may not know:

Contractors frequently (deliberately?) misdiagnose ductwork problems as insufficient cooling: Some rooms are not cooling, so the system must be too small; it's good business for a contractor. In fact, I've never seen an undersized residential system; the most frequent problem is "Too Much Equipment, Too Little Ductwork". I normally reduce cooling capacity when I develop an Improvement Plan.

Something controversial or provocative about this subject

Installing ductwork is a labor intensive operation, and many contractors profit by doing it too quickly. The end result is energy intensive: Conditioned air leaks to/from unconditioned spaces, too much heat is gained/lost because of improper insulation, rooms are overheated/overcooled because the system can't be balanced, etc.

Average Ratings

Recent Answers from Fred Weldin

2015-02-27 air conditiion with heat pump:

Ginger:    As you guessed, I do have a heat pump. My compressor runs when the heat is on (to provide the heat). It cycles on and off as required by my thermostat, and continues to run (it doesn't "cut

2014-12-01 4 ton condensing unit:

Howard:    You omitted the "6" from the AC M/N (SHB "NXA6..."). The HXA6 is a heat pump. They're both 16 SEER.    I presume you're replacing outdoor unit, indoor coil and air mover (furnace???), because

2014-11-20 installing duct blanket insulation on sheet metal duct:

Micheal:    Any duct 18" or wider must have the pins. Note that I prefer weld pins to adhesive pins, which cal detach. The average installed thickness must be at least 2-1/4" to achieve R( "Installed Value"

2014-08-30 SEER Rating:

There are no ratings for that unit at AHRI. I did run across a Ruud UPMC service manual indicating it's a 12 SEER. However, the coil is not a Ruud product, so the rating of your combo is unknown. Again

2014-08-29 SEER Rating:

Hello Adriane!    You'll need more info: I think you've provided the M/N of the cooling coil, but you'd need the mfgr. and M/N of the associated outdoor unit and furnace M/N (Lendell appears to be a furnace


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