Thank you as always for the great information Do you do do all the testing after the customer signs the contract? I always do a block load calculation but am hesitant to break out other test instruments or do a room by room calculation Suggestions?
We always did the testing after the signed contract. However, here in California we have the Quality Residential HVAC Services Program that pays me ahead of time to do all the testing and load calculation $700 and the customer is under no obligation. So, now we convince the customer to let us do all the testing. This sells jobs as no other contractor is doing this. This program came out a little over a year ago. If your in California here is a link to the Quality Residential HVAC Services Program. qualityhvac.frontierenergy.com/
When you do a heat load calculation and duct design and you find out the existing system is oversized. Do you change the existing boot boxes for the proper throw? Or do you work with what is existing? Example we have a system that has a 1267 boot box in a room. The heat load indicates a 65 CFM for the room. I believe our design boot box for the throw was a 646 box with a curved blade grill located by the wall blowing out towards the exterior wall. Would you replace the boot box or work with it? Thank you for your input.
12X6 box with 7" collar is a little large, I believe you would be better served switching to the 6X4 with a 6" collar. However, the proper register will also help. I would use a Shoemaker 950 sidewall register to throw the air. Without knowing the dimensions of the room I am not sure if I would swap out to the smaller box. If the register is too large you will not keep the airflow high giving you better throw so that you will get good mixing of air in the room. That being said, I hate patching so I would use the same box and use a 950 to get the best throw from the register.
Great content
Thank you as always for the great information
Do you do do all the testing after the customer signs the contract? I always do a block load calculation but am hesitant to break out other test instruments or do a room by room calculation
Suggestions?
We always did the testing after the signed contract. However, here in California we have the Quality Residential HVAC Services Program that pays me ahead of time to do all the testing and load calculation $700 and the customer is under no obligation. So, now we convince the customer to let us do all the testing. This sells jobs as no other contractor is doing this. This program came out a little over a year ago. If your in California here is a link to the Quality Residential HVAC Services Program. qualityhvac.frontierenergy.com/
@ thank you, I am located in Orange County California I will reach out regarding this program
When you do a heat load calculation and duct design and you find out the existing system is oversized. Do you change the existing boot boxes for the proper throw? Or do you work with what is existing?
Example we have a system that has a 1267 boot box in a room. The heat load indicates a 65 CFM for the room. I believe our design boot box for the throw was a 646 box with a curved blade grill located by the wall blowing out towards the exterior wall. Would you replace the boot box or work with it? Thank you for your input.
12X6 box with 7" collar is a little large, I believe you would be better served switching to the 6X4 with a 6" collar. However, the proper register will also help. I would use a Shoemaker 950 sidewall register to throw the air. Without knowing the dimensions of the room I am not sure if I would swap out to the smaller box. If the register is too large you will not keep the airflow high giving you better throw so that you will get good mixing of air in the room.
That being said, I hate patching so I would use the same box and use a 950 to get the best throw from the register.