Mechanicals
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High velocity trunk insulation – do I need it?
New construction in Klamath Falls, OR. Note this is 4400' elevation, east of the Cascades, a high desert basin, not Portland!! We're using radiant heat with a high-velocity A/C-only ducted…
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Zoning vs. multiple heat pumps
TL;DR: for a central ducted heat pump system in a large house, is it better (performance-wise, more cost-effective) to use a single heat pump +/- zoning for each floor, versus…
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HVAC replacement in ICF home–Hydronic A/C and radiant floor heat
Hello! We have an ICF home in USA zone 6a, which is from -10°F to -5°F, or -20.6°C to -23.3°C in the winter. Our normal winters tend to be more…
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1″ EPS foam board under hybrid water heater to dampen vibration?
Rheem recommends placing something underneath their ProTerra hybrid water heater to prevent it from transmitting vibration into a raised, non-concrete floor inside a house. They make a vibration isolation kit…
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Conditioned crawl space HVAC help
I live in british columbia and have a sealed crawl space with a high efficency natural gas furnace and an ICF foundation. The crawl is heated via the furnace. There…
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How many fully ducted systems are really needed?
Designing phase. 1340 sq ft ranch in 5a. Heating load will be around 18k. Will a centrally located minisplit air handler do the job if supported by a fully ducted…
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Range vent hood blower – troubleshooting
Ten years ago, this house by renovated by a previous owner. The range hood was made by GE, although the blower was made by Best. According to GE, it typically…
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410 vs 454b refrigerant
hi, mechanical professionals ! I notice that neither mitsubishi nor fujitsu (both are common brands in my community) offers a “cold climate” heat pump compressor that allows any refrigerant other…
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Help Pls: Mitsu Hyperheat final sizing decision
Info: Air sealing done (-50% infiltration, 11 ACH > 5!), Attic ccSPF flash + Timberfill loose to R-50. Data taken through winter shows an actual heat load of 35k @…
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Desuperheater – still economical?
So a friend of mine who is a conventional HVAC contractor is trying to talk me out of a desuperheater as part of my geothermal heat pump, which will run…