Walter Ahlgrim replied to Ben L Menol's discussion Split air conditioner ruined by birds. Will this work after repairing?
"In my opinion the unit should be an easy repair.
Cleaning up after a bird is dirty work maybe a little dangerous because some birds do carry diseases that can affect humans.
All the important parts of the refrigeration system are inside the sealed…"
May 9, 2020
Walter Ahlgrim replied to Paul Raymer's discussion Capillary break retrofit
"I think you are confusing terminology.
Capillary break retrofit is an impossibility.

A sheet of plastic under a slab of concrete = vapor barrier

 
A water proof barrier between the footing and the foundation walls= Capillary break

 Walta"
Jan 23, 2020
Walter Ahlgrim commented on Building Performance Journal's blog post HVAC Industry Trends: 7 Things Every Contractor Should Know
"Will you please define your terms? Or provide a link for each.

Smart HVAC Someone connects a Nest thermostat to their 60 year old steam boiler and suddenly that have a smart system?
 
DeVAP HVAC Google found an interesting research paper. Is there…"
Dec 23, 2019
Walter Ahlgrim commented on Kristina Frunze's blog post HCFC Refrigerant Ban: Everything Contractors Need to Know
"Just to be clear are the popular 134A and 410A products covered under this ban?
 
Walt"
Dec 17, 2019
Walter Ahlgrim replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Eric and David you may find this laboratory study of real world dirty AC coils brought in to the lab and studied how they worked. They tested the dirty air conditioners, then washed them thoroughly with a garden hose and tested again. They also used…"
Oct 14, 2019
Walter Ahlgrim replied to Julie Saporito's discussion Heat pump failure during high heat days?
"“The magnitude of the outside-inside delta-T has no bearing on the amount of work done by a heat pump over a given period of time. “ I disagree the inside outside delta is directly proportional to the number of BTUs required to maintain that delta,…"
Oct 2, 2019
Walter Ahlgrim replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Please share this “news of failure rates tied to high heat days” Where did you get this “news” from is this data anecdotal or statistically?
The cold climate heat pumps IE hyper heat models are almost two stages systems with an extra port in the…"
Oct 1, 2019
Walter Ahlgrim commented on David Byrnes's blog post Why Phoenix Is Called "The Land Of No Return"
"I do not understand your sizing chart you say “22” return on a 5 ton AC unit” is that a 22x22 square or 22” round or any shape with 22 square inches.
I do like the chart
https://www.hamiltonhomeproducts.com/vb/Repository/InstallationManu...
My…"
Jul 22, 2019
Walter Ahlgrim replied to Luis Hernandez's discussion Water heater ventilation question
"That black spot looks to me like someone was sloppy with their torch while working on the copper pipes and burned the PVC.
The first pipe does look like CPVC I do not recall seeing CPVC listed as approved vent in any instructions. The way PVC cement…"
May 7, 2019
Walter Ahlgrim replied to Luis Hernandez's discussion Water heater ventilation question
"Read the instruction manual closely. You should find limits for the size, length and number of bends allowed.
You may want to look inside the pipes, small animals have been known to crawl in and die.
 
Walta"
Apr 22, 2019
Walter Ahlgrim replied to Jan Green's discussion Mini split installation location
"Being a Flip you must consider the install cost. At least get a bid for a PTAC unit like the ones found in most hotel rooms.

With either choice I would put it on the long wall so it is closer to the center of the room.
If the unit is mostly for…"
Sep 24, 2018
Walter Ahlgrim replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"This is one of thouse topic where you ask 10 people and get 12 different opinions. I will give you 5. :)

There is no clearly right answer. Some if this depends on who you are where your house is and what type of house it is.

In my opinion if you…"
Sep 17, 2018
Walter Ahlgrim replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with dampers
"It seems the question was asked in Nov of 2013 maybe the OP will reply and tell us how the system has worked for the last 4.5 years.
 Walta"
Aug 31, 2018
Walter Ahlgrim replied to Paul Raymer's discussion Stud cavity air returns
"Last year we build a new home the HVAC seemed to work perfectly after a full season of both heating and cooling I happened to notice the contractor had forgotten to pan one end of a floor joist bay being used an the main return duct. I tested the…"
Aug 31, 2018
Walter Ahlgrim replied to Pamela Brown's discussion Condensation on an interior wall of a detached garage.
"Do not be fooled it is very common problem for cast iron wood working equipment to sweat and rust if keep in  a unheated garages when the weather changes quickly from cold to warm and damp.

Now wet drywall is very strange. To me drywall does not…"
Mar 17, 2018
Walter Ahlgrim commented on Efficiency First California's blog post Get Fire Out Of Our Buildings
" “From an efficiency standpoint electricity is a clear winner.” Baloney not when you count the losses at the power plants most plants are 45% efficient and you lose another 7% in distribution and transmion.  The very best solar panels are just 30%…"
Mar 10, 2018
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