Follow up from a specific conversation I had with a customer on New HVAC Guide... After getting quotes on replacing the HVAC system, then contractors want to do the heat load calculation after they are picked?
How absurd! And that's being nice about it. I've never heard something more backward. There is a chronological order to all of this and the heat load calculation is one of the first things that should be done in the process.
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Hey guys, i wanted to do this video and i wanted to address an issue with one of our customers on newhvacguide.com i'll, put a link to that website down below, but one of the things we were talking about is this customer was kind of just you know They were talking to me about their situation and they had gotten a few quotes from a few different contractors and they just had a few questions and one of those questions. So if you see this video, the guy that i was talking to about this one of those questions was, he was basically just saying look. None of these companies have really done a proper heat load calculation and i have had these issues in the past and i explained to them. I was like you know, even if you have to pay for it, you know, even if you have to ask someone to do it and you have to pay for it to be done, it would probably be in your best interest based on these past issues, that You've had to have a proper heat load, calculation done and one of those companies said to him.

Well, we'll do the heat, low calculation. If you choose us, if you, if you pick us out of the proposals that you've gotten so far, we will then do a heat load, calculation and all that stuff. I thought that was a little weird. You know i kind of talked to him about it, but let me let me just address that in this video and let me just say if you do have a contractor that says something to that effect.

If they say look, you know we'll do a helo calculation. After you choose us after you pick us and the system that we're trying to sell you, here's the main issue i would have with that in the defense of the heating and air company. They may be just saying that, because they're like look, i'm not gon na. Do one for free - and you know i'm not gon na you know waste my time and go out there and do a proper heat load calculation just for you to get the size that you need for your home from me and then choose someone else.

So maybe that's why they said that my only issue with that is, let's just say they do the heat load calculation. So you choose them, you know so you you know you've you've gotten three quotes. You know you got a a three ton: linux, a three ton train and a three-ton carrier right. So you got your three quotes and each one you know each one of them is telling you why you should choose them, and you know you're trying to figure out who you like and all that good stuff.

Let's say you pick, you know one of these companies, so you now got one company left you've chosen them for whatever reason to do your system - and you know, they're doing a three ton system and this many seer and so on right. What if they do, their heat load calculation and they find out that it is not sized properly right. So the three ton is either too big or too small for the space, and now they've now got to adjust it and change it up right. So now you've got a a company that you've chosen you've, maybe even signed a contract with right and now they're telling you that they either need more money or god forbid, they, you know, put in a wrong size system or they go and they put in a Smaller system, because that's what the heat low calculation calls for, but then they still charge you for the three ton right.
So i'm just kind of throwing some things out there uh just kind of mental notes. You know just kind of riffing on that, but that that's a little weird in my opinion, so i think that again, if even if you have to pay for it, have one of those companies do a proper heat load calculation and, let's find out you know what Is so we can compare apples to apples? What do we? You know? What are we going for here? So hopefully that makes sense. Now, some of you - i i was just talking to a guy just last night i believe - was or maybe it was the night before, but we were just kind of messaging back and forth on youtube and he was saying hey. You know i looked up on this website that you know my house.

Is this many square feet and so i'm just kind of trying to decide. You know i'm kind of in between those two square feet. So you know, should i go with this size system or that size system, and i just want you to know, there's so much garbage on the internet - uh not just about heating and air, but let's just only talk about heating and air, i'm not going to get Into all that other right, but just with heating and air those websites that give you that kind of rule of thumb, you know general idea of what size your system should be. Those are just rule of thumbs.

They're, just you know, general something that someone has thrown together: it's not a proper heat load calculation. Again, i'm a common sense kind of guy. So if you've always had a three ton system in that house and you've never had any issues and everything was you know sized right from the get-go and installed right and so on. Then you know i'm a common sense kind of guy.

I'm not saying you need to have a heat load calculation done at that point right, but when they do a heat load calculation, it's not just square footage they're going to take into account cubic feet of that house. So, in other words, how how are the ceilings? What are the r ratings of all the insulation ceiling floor walls? How many windows are there? How many appliances this that you know even things like you know a hot tub and things like that? These all play a role in what size system you need. What part of the country are you in right? You know just to say: oh well, it's this many square feet so and i'm in florida, and it says i need this size of system. You know you take that same exact thought process and you go all the way over to the other side of the country and, let's say we're now in oregon and in oregon.

It's that many square feet, but now you've got double the height of the ceilings and the insulation's different and whatever square footage is useless. At that point, not all houses are created, equal right and then. Finally, if you are in the market for a new heating and air system, if you're in the middle peninsula or northern neck of virginia, give us a call griffinair, we would love to earn your business. But if you're not in our coverage area, you're somewhere else in the country - and you are in the market for a new heating and air system before you spend thousands check out my new website, it's called new hvac dot, i'll put a link to it down in The comments and this website, i basically wrote a book made it a guide, put it on this website and instead of having a book that would be outdated within a year or two, i'm able to constantly add things on there if new things come out and the Other thing is i've even put information on there that people in our industry don't even want you to know so.
I've got a whole page called no no's, and you know just things to stay away from, and so on. That being said, thanks for watching hit that subscribe button, we'll see you next time.

3 thoughts on “Duh! backwards logic by some hvac pros. heat load calc. after sale?”
  1. Avataaar/Circle Created with python_avatars Team Drummond says:

    I used to do manual J's. They were fun.

  2. Avataaar/Circle Created with python_avatars Emre Yurttas says:

    Why do contractors use rules of thumb instead of load calculation?

  3. Avataaar/Circle Created with python_avatars Albert Levet says:

    Thanks for another informative video. I wonder how many HVAC companies actually do a proper J Load calculation even when required by code? Are you in Ottawa ?

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