Julie Saporito
  • Female
  • Denver, CO
  • United States
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Julie Saporito's Discussions

Heat pump failure during high heat days?

Started this discussion. Last reply by Kent Browning yesterday. 14 Replies

Are there studies or have you had experiences where heat pumps have failed to cool on high heat days? We've known that cold climate heat pumps are needed in areas with colder climates (like Denver)…Continue

Tags: climate, cold, pump, heat

Tankless water heating and existing gas lines

Started this discussion. Last reply by Kent Browning Sep 14, 2018. 5 Replies

If a tankless water heater is installed in an older home with existing gas lines that serve the furnace and stove, how do you determine if the line is sufficient to supply or if it needs upgrading…Continue

Studies on Home Energy Audit Energy Savings Potential?

Started this discussion. Last reply by Danielle Sass Byrnett Jun 15, 2017. 5 Replies

Looking for studies that have made the case that an energy audit leads to energy savings. Are there recent studies out there on this topic?Continue

 

Julie Saporito's Page

Latest Activity

Kent Browning replied to Julie Saporito's discussion Heat pump failure during high heat days?
yesterday
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…"
Tuesday
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Eric, excellent point. Keeping those coils clean is paramount to both short and long term system performance!  But I think multiple cleanings per year by a professional (I see you're a mechanical contractor) is a bit excessive for most…"
Monday
Eric Kjelshus replied to Julie Saporito's discussion Heat pump failure during high heat days?
"I find most heat pumps need cleaning 2- 3-4 times a year.  When dirty coil do not transfer heat well.  High heat kills compressors and motors.  With lack of air flow or water vapor in HVAC system just rotts.  I have air and water…"
Monday
Kent Browning replied to Julie Saporito's discussion Heat pump failure during high heat days?
"This might be a little off topic for the question you asked - The industry is seeing an extremely high failure rate of capacitors for the last 5 to 10 years. My personal (anecdotal) experience is the capacitors fail more frequently as the outdoor…"
Friday
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"@Walt, I hesitate to respond since this is rather off-topic, but my previous comment apparently wasn't clear. My rebuttal was directed at your comment that a "...heat pump works much harder on the coldest days."  That's not…"
Oct 3
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…"
Oct 2
Julie Saporito replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Walt - A partner city said that there is some research that heat pumps have higher rates of failure in the heat. I am trying to find out if a report has been completed on this topic, or where this came from as well and will share as soon as I can…"
Oct 2
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Walter wrote: "In truth my heat pump works much harder on the coldest days." This is a common misconception. 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.…"
Oct 1
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…"
Oct 1
Julie Saporito replied to Julie Saporito's discussion Heat pump failure during high heat days?
"This is extremely helpful, thank you David! I will circle back if I come across any future reports on more clearly defined issues with heat pump failures on high heat days. "
Sep 30
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"I think you took my 'hottest day' comment a bit too literally. In any case, there's no doubt that certain failure modes are more likely as outside temperatures climb (more stress on components). And yes, a heat pump is nothing more…"
Sep 27
Julie Saporito replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi David - Thanks for replying. Yes I'm referring to the cooling mode of a heat pump, i.e. air conditioning. In all honesty I don't know what the specific failures are, but wanted to inquire with folks to see if there was any common…"
Sep 27
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Julie, as a point of clarification, in cooling mode a heat pump is essentially an air conditioner, and there's nothing new about A/C failures tied to high heat days. Everyone knows that air conditioners always seem to fail on the hottest day…"
Sep 26
Julie Saporito posted a discussion

Heat pump failure during high heat days?

Are there studies or have you had experiences where heat pumps have failed to cool on high heat days? We've known that cold climate heat pumps are needed in areas with colder climates (like Denver) however news of failure rates tied to high heat days was new. Looking for input to inform whether or not this is common or still being tested in different climate zones. Thanks!See More
Sep 26

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Company
City & County of Denver
Role in Home Performance Marketplace
Government: local
Website URL
http://www.denvergov.org/homeenergy

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