HVAC New Units

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shippa Active Contributor Join Date: Jul 2017 Posts: 21	HVAC New Units 10/17/2017 10:49 AM
	Hi there, I will tell you guys right up front that I have NOT done a lot of research. I will after I get some input from you. I have not done a TAB report in the building yet, for example. It is in the works. I am looking into replacing two old HVAC units. They are from the 50-60s, and they are a constant volume system. I would like to design the next system as variable air volume. The building has a lot of open areas and currently only two units. All that said, without having a contractor on site, I would like to get costs for two new nice units, something around 10,000-15,000cfm per unit should do the trick. Maybe I will get three units. Any thoughts and/or suggestions would be appreciated.
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ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 5197 Good Answers: 266	#1 Re: HVAC new units 10/17/2017 11:26 AM
	You want air flow or to cool the building? HVAC is sized on the amount heat they displace not air flow. That is calculated by the size of the rooms. You should be able to find a calculator on line to get you the size of HVAC you need. https://www.highseer.com/hvac-load-calculator/ __________________ Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
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DantePruitt Active Contributor Join Date: Sep 2018 Posts: 10	#5 In reply to #1 Re: HVAC new units 09/07/2018 1:40 AM
	Very true. But it would be very nice to consult a professional for the same for the second opinion.
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Anonymous Poster #1	#6 In reply to #1 Re: HVAC new units 03/23/2019 7:25 AM
	good to hear this
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CherylmcCall Participant Join Date: Mar 2019 Posts: 2	#7 In reply to #1 Re: HVAC new units 03/23/2019 7:26 AM
	Hey, Wow, that's a such an awesome innovation of such calculator which identify how much Air does a room really requires. Many HVAC contractors like AC service Santa barbara also calculates the distance and after that only they install the AC or other HVAC appliances in the room. This calculation makes them easy to identify how much amount of Cooling Air is required for the room.
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#2 Re: HVAC new units 10/17/2017 12:32 PM
	This is something that has to be done on site....Everything has to be taken into account, including building structure...First a heat load must be calculated, then placement, efficiency, ductwork, power availability, type of unit....takes a pro __________________ All living things seek to control their own destiny....this is the purpose of life
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James Stewart Guru Join Date: Mar 2011 Location: Lubbock, Texas Posts: 14331 Good Answers: 162	#3 Re: HVAC New Units 10/17/2017 1:43 PM
	You need professional help on this one. It is by "tonnage", not cfm air flow. __________________ If it ain't broke, don't fix it. Just build a better one.
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Tom_Consulting Guru Join Date: Oct 2009 Location: Maine, USA Posts: 2168 Good Answers: 71	#4 Re: HVAC New Units 10/19/2017 9:10 AM
	"I have NOT done a lot of research"...and when you do you will find your answers! __________________ Tom - "Hoping my ship will come in before the dock rots!"
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Anonymous Poster (1); CherylmcCall (1); DantePruitt (1); James Stewart (1); ozzb (1); SolarEagle (1); Tom_Consulting (1)

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