sizeing furnace's[quicky]

[roosterman]

I calculate a furnace[quicky]average insolation ,no holes in wall's,etc,window's,looking,we'll insulated[weather stripped] 40btu's per square foot exampel 2000 squar foot liveing area multiplied by 40 btu's =80,000 btu furnace i would appreciate any feed back P.S yes a can read the cooling/heating load manuels,this has way save's me some time and it's worked good for ME[feed back wanted]

[billva]

oh crap....

[Wild Leg]

I wouldn't use it.

Brave man to post it here...

[btexpress]

There is no magic formula for all installations. There are way too many variables involved. If you have used load calcs in the past, I would suggest doing so in the future.

[BaldLoonie]

You stand across the street and put your hand in front of the house. The number of fingers it takes to cover the house is the number of burners the furnace needs.

[beenthere]

You said that way has worked well for you.
I guess that means you have never been undersized.
But, how do you know your not oversized by 30, or 40%?

[filterchanger]

Hey guys I think after reading some of willies post that he is just jerking our chains,,,he cant be for real

[prtslnger]

Just ask your supply house guy "Hey I got a 2000 Sq Ft house. What size do I need?" And they will hook up!

[justri]

no you are right as a quick refernce thats good. The only thing i do differently is if ther is a cathedral ceiling i take the cubic footage and x 5 and never had a problem

[fireye03]

baldlonnie's stand across the street finger calculation works well for sizing a/c units 1 finger = 1 ton

[beenthere]

Originally posted by fireye03
baldlonnie's stand across the street finger calculation works well for sizing a/c units 1 finger = 1 ton

Also works for boilers, 1 section for each finger.

[karsthuntr]

If he was doing my house I would have a finger for him.

[pipedope]

that is why he isn't a proffesional member!!!!!!! You can see his install work at the wall of shame.

[sline-dawg]

If you have a 2 story house, do you HAVE to use both hands.... or just a percentage of the first five digits ?

[jrbenny]

Do you stand on the curb next to the house or the one across the street? I always get so confused when doing load calcs.

[1manband]

The sizing by "rule of thumb" is really starting to piss me off. I spend the time and money sizing all of my systems, manual J and D. Some dumb-ass comes in and does the three fingers sizing, doesn't have insurance, no workers comp, and gets the job after I have invested 4 hours in the project to size it right. And to top it off the homeowner gives my calculations to "Dumb-Ass Heating & Cooling" to use. I have to get hard-case about giving the homeowners the calculations from here on out. No Contract No Calculations, PERIOD.

[Irascible]

Originally posted by 1manband
No Contract No Calculations, PERIOD.

I’m with you one man. I'm curious though. Will you withhold the specific tonnage and BTU's from the H.O.? In other words, not even tell them verbally? What will you put on the estimate? If you let the cat out of the bag even verbally then your calcs may still end up in Dumb-A’s hands.

I haven't really decided yet. But I think I'm going to skip doing calcs in advance of the contract all together. I'll either give them one cost that covers any possibility. Or I'll give a bid for a couple different tonnages and BTU ratings and let them know we'll go with the one that matches the final load calc. Whaddayatink? I can show them example load calcs from past jobs and educate them about their importance. But it's too much damned work doing them (at least it is on these large square footage houses with all the architecturally odd shapes) just to get turned down.

[1manband]

I will give an example:

I got a call from a homeowner that was in the process of picking a heating contractor for his 9000sq/ft. home about a month ago. I provided all of the documentatation on efficiencies, warranties, load calcs, air quality, and pricing on a ton of options. The homeowner calls back with a boat load of questions regarding the proper way to install the system, no problem. A week goes by and I am at the supply house and overhear "Dumb-Ass Heating and Cooling" bragging about the big job at xxxx S. Main Street they are doing. OK so I didn't get the job. Two days later the "homeowner calls and asks more questions about the job, I say no problem I will meet you there in 20 minutes, and hang-up. I get to the job and the general tells me that the heating company has been on the job for 3 weeks. No Contract No Calculations No Install Instructions, PERIOD.

[Edited by 1manband on 02-08-2005 at 11:56 PM]

[Irascible]

The really aggravating part for me is that these same low life scum bags often consider themselves basically honest. They rationalize it a million ways. But in reality they're thieves.

[roosterman]

we'll I see there are alot of know it all's!!!!you guys sound,like masters[masterbators]just had to put that in ,listen not getting ugly,i appreciat the guy who gave me the tip on the for your info,section,the rest of you all ,im glad you all dont run the world[greedy,S.O.???]and I will say YES you all are VERY smart????[you can tell a lot about a person in just what they say,dont youall agree,
OH one last thing guy's & girl's,YOU WILL SEE MORE POST'S from me ,when i do "brush-up"and get 'smart' like all you Super High Intelegent Tech's,I will give ANY one a good tip,with out the smack [lolololol]thank you'all