heat pump myths, efficient heating, Mitsubishi HVAC, cold weather efficiency

Debunking Common Heat Pump Myths: The Ultimate Guide

Foreword by Ian Thompson, Editor

Today, Matt is debunking some heat pump myths, particularly for use in cold climates. Joining Matt is Dave Hazel from Mitsubishi, a leading manufacturer of heating and cooling systems. This video is particularly beneficial for anyone considering different heating options for their home, as we delve into the practicality and efficiency of heat pump units.

One of the key points discussed is the common belief that heat pump units, like Mitsubishi’s HVAC system, don’t work when it’s cold outside. Dave addresses this misconception by explaining how technology has significantly advanced over the years, enabling modern heat pump units to operate efficiently even in sub-zero temperatures. For instance, the 4-ton heat pump unit discussed in the video can still produce 100% heating capacity down to 5 degrees Fahrenheit, and 87% capacity even at -3 degrees Fahrenheit.

Another myth that is busted in this video is the perception that heat pumps produce cold air. Dave explains that the new generation of Mitsubishi’s VRF equipment can output air at around 115 to 118 degrees Fahrenheit, which is more than sufficient to maintain a comfortable room temperature.

This video is a great resource for understanding how heat pump units work, their efficiency in various weather conditions, and how they can be a viable heating option for many homes. Whether you’re located in a cold climate like Boston or a warmer one like Texas, this video provides valuable insights to help you make an informed decision about your home heating system.

Over to Matt and Dave.

Debunking Common Heat Pump Myths: The Ultimate Guide

Video Transcript

What’s up guys? The Build Show today. I’ve got Dave Hazel from Mitsubishi and we’ve got three heat pump myths for you. Let’s get going.

All right Dave, very common to hear people say that heat pump units like your Mitsubishi HVAC system here don’t work when it’s cold outside. Now we’re on a Boston job site. What do you say to somebody who says “you can’t use a heat pump in a cold climate”?

Well, I’m going to say that they’re thinking back 30 years ago, 20 years ago even, 15 in some cases, that all that technology is all changed today, and we have the ability now to heat well below zero. So, this unit behind me is a 4 ton, uh, heat pump unit. In the wintertime, how cold can it be outside and still get 100% heating capacity out of my 410 unit?

Well, they’ll produce full capacity heating down to 5 degrees. We have some units that will go down to minus 5 full capacity. And this is Fahrenheit, don’t forget Fahrenheit.

Correct. And down to -3 you get about 87% of capacity at -3. Holy cow! Minus 3 out and we’re still pulling 87% capacity.

Correct. They’ll still operate down to about minus 20 degrees. That’s amazing! Now, do you know, full disclosure though, they’re not as efficient, right? When it’s 10, 10 degrees or minus 10 degrees out they’re even less efficient. But you know in most places of the world it’s not minus 10 most of the time. Even in snowy Boston. Uh, it’s December and today’s highs in the 40s so you’re going to be just fine with a heat pump in these conditions.

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Now Dave, another myth that I remember growing up, I grew up in Pennsylvania, uh I remember people saying “Oh, those heat pumps, we don’t want a heat pump in my house. I got to have gas,” because it feels cold when you use a heat pump.

You know when I was growing up in the 80s uh heat pumps are outputting let’s say 90 degree air in the winter time which felt like, to my hand, which is 98.6, kind of cold, right? 90 degree air but it would warm the thermostat. That up we could stay at 72 with 90 degree air. This unit behind me though, this new generation of Mitsubishi’s VRF equipment, how hot is the air coming out of this unit?

It’s going to be coming out about 115, 118 and when you only want to keep a set point of about 70, 72 degrees anyway, there’s plenty of heat in there to keep it one degree within that set point plus or minus of temperature, yeah.

So in other words there’s a lot of heat pump myths that are still out there and I’ll be honest, this is going to apply to a lot of heat pump manufacturers.

We’re using Mitsubishi here on this unit. I’ve used a lot of Mitsubishi since 2010, they’ve really been my main heating and cooling system in my house down in Texas but I appreciate you joining me Dave, busting a few myths, thank you man!

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