Why You Can't Size a Variable Speed Heat Pump to Your Existing Duct System

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Are you considering upgrading to a variable speed heat pump, but you're unsure if your existing duct system can handle it? By the end of this video, you'll have a clear understanding of why it's essential to consider your duct system when installing a variable speed heat pump. You'll also gain valuable insights into duct sealing and insulation, helping you make informed decisions to optimize your HVAC system's performance.
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Chris Morin is the Author, Owner & Founder of the popular HVAC Pro Blog. For Advice with Residential HVAC System Design, Quality Installation, and System Diagnosis, you can find Chris’ Articles on HVACProBlog.com, Exclusive Member Content on Patreon, or popular social media outlets Facebook, LinkedIn, Twitter and RU-vid.
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Опубликовано:

27 июл 2024

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Комментарии : 15

@joelperigo7213 9 месяцев назад

I believe our company is probably the only one in our area actually doing heat load calculations. Every other company in our area goes into a house, counts up the registers, and divides by 4. That is the tonnage they install. Customers are always wondering why we are measuring their windows and checking the insulation in the crawl space and attic when every other estimate only took like 30 minutes to complete.

@HVACProBlog 9 месяцев назад

Keep educating homeowners and fighting the 'good fight' Joel! Even though this is a code requirement, and typically needed for most utility rebates/programs, I also see the same thing across the entire Northeast. The quality guys that do load calcs as part of their process build tremendous value and trust with the Homeowners...

@robo7981 5 месяцев назад

Great video! I don't know why 9 out of 10 guys say my existing AC duct work would be fine for heat pump. QUESTION Should the placement of ceiling grills/registers be changed when switching from AC only to a heat pump? Thanks!

@HVACProBlog 5 месяцев назад

Thanks for watching! It is possible that replacement of the supply registers will be necessary, depends on the cfm, throw, and spread of each. In order to verify this, a room by room load calculation and Manual D Duct sizing (runs) worksheet is needed...good luck!

@MITERMAN1212 9 месяцев назад

Thanks!

@HVACProBlog 9 месяцев назад

You bet! Thanks for your support!

@elijahyasi5858 8 месяцев назад

What's the best method for checking duct leakage? We offer Aeroseal but the modern customer is skeptical about a lot of things you tell them. What's the best way to measure duct leakage on a maintenance call?

@HVACProBlog 8 месяцев назад

@elijahyasi5858 Thanks for watching! The most common method for measuring duct leakage would be with a duct blaster, like from The Energy Conservatory. This takes some time to setup, a total time typically 45 minutes or so, but far less than Aeroseal to just measure leakage. Of course, nothing seals the ducts better than Aeroseal! On a maintenance call, in a hot or cold attic, I have measured temp and wet bulb to check the efficiency of the duct system. If the ducts are at least R-6 or R-8, then large temp differences from the return grill to the unit could indicate some leakage, same on the supply. This is just a quick test to see if measuring with a duct blaster is recommended...Hope this helps!

@johnwhite2576 9 месяцев назад

chris - should you always insulate supply ducts inside conditioned space (esp under first floor? if so, what R around that duct ? what about insulting return ducts within conditioned space ? overkill ?

@HVACProBlog 9 месяцев назад

Hi John! Thanks for watching! YES - you must insulate the supply ducts whether inside or outside the conditioned space. This is to avoid condensation in cooling as the temp of the ducts can still get below the dew point of the air. The 2021 IECC says R-8, local code may specify otherwise. Return ducts inside the building envelope should be the same - yes, a bit of overkill. They at least must meet the particular portion of the assembly insulation required (like if in a floor joist or ceiling joist)...hope this helps!

@robo7981 5 месяцев назад

My central AC is 15 years old. My oil fired water baseboard is close to 25 years old. I am being proactive looking into a heatpump system for the near to intermediate future. I have had several people come in, but all I get is either 'use your current AC ducting' with a new heat pump or 'here's our recommendation for a split system.' The one reasonable exception was a recommendation for my current flex to be replaced by a tin/hard ducted system. But NO ONE does an analysis as you suggested. Can you recommend anyone in my area, even if I pay for an analysis & system recommendation from an expert 'heat pump consultant? Please attach any disclaimer on your end. Thanks! Rob --- Westchester County NY 10598

@larryl22 13 дней назад

Local contractor oversized my heatpump ( I have increase in humidity, my system runs longer, and my evaporator coil truck / supply is always sweating, etc) what can i do now? Need advice. my sqft is 3490, i have 2 zones (upstairs and downstairs) the unit in the basement was replaced with a heatpump.

@HVACProBlog 12 дней назад

Thanks for watching @larryl22! I would recommend you find a quality local contractor to complete a load calculation on your home. Based on this, it may be possible to manipulate the airflow low enough to decrease system capacity...this may require a refrigerant charge adjustment as well depending on the type of system. This will not however fix your duct condensation issue. The ducts are below the dewpoint of the air...sounds like you may either need insulation on the supply, dehumidification in a basement (if the ducts are downstairs), or ventilation of your attic (if the ducts are up there)...

@larryl22 12 дней назад

@@HVACProBlog can you please recommend a contractor...i live in milford, ma