HVAC

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HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.

Members: 155
Latest Activity: Mar 31

Discussion Forum

ENERGY STAR Furnaces & Failure of DOE Standard 3 Replies

Any speculation on why DOE was not able to make its new minimum federal standard for furnaces stick?…Continue

Tags: effectiveness, cost, market, share, ECM

Started by Barbara Smith. Last reply by William H Nickerson Mar 31.

Where to find EER and SEER if it is not on the label 4 Replies

That's allJudiContinue

Started by Judi Lyall. Last reply by Bob Blanchette Dec 29, 2012.

Are Zoned Heating/Cooling Systems a Good or Bad Idea? 13 Replies

For starters, I live in Atlanta, Ga and I am not an HVAC pro so this is a serious question that I would like answered for one of my clients. I understand the premise of a zoned system and on the…Continue

Started by Jon LaMonte. Last reply by Bob Blanchette Dec 29, 2012.

Furnace Blower Fan on 100% of the time - Good or Bad or it depends? 71 Replies

I was at a dinner party last night and two guests described how their HVAC reps told them to run their furnace blowers 100% of the time. The HVAC reps reasons for the recommendation, as relayed by…Continue

Tags: motors, energy, IAQ, HVAC

Started by TJ Ewing. Last reply by dale conner Dec 23, 2012.

Looking for a good load calculation software 15 Replies

Hey all, My company is going to be installing a few ductless heat pumps very soon and I'm going to need a load calculation software. Any suggestions?Thanks, AndrewContinue

Started by Andrew Vidal. Last reply by tedkidd Oct 18, 2012.

Now for Something Different

Now that my wife and I are involved in BPI training and plan to conduct field test at our residence, the work scope for integrated HVAC has become more involved. We'd like to use our efficient…Continue

Tags: test, site, BPI, heating, HVAC

Started by John Porterfield Oct 17, 2012.

Effective heating for handicapped 3 Replies

Looking for a good suggestion for heating an electric home for a handicapped person... they get cold easily. Currently has radiant ceiling heat upstairs with a couple cheap wall heatersin the…Continue

Started by Kent Mitchell. Last reply by Kent Mitchell Oct 12, 2011.

I used the wrong title: What are the pros and cons to a HEAT PUMP not hydronic system 3 Replies

Sorry folks. It not hydronic but heat pumpJudiSHE BUILDS GREENContinue

Started by Judi Lyall. Last reply by Kevin DeBord Oct 12, 2011.

Good article on why HVACR contractors should dominate the home performance market

Check out this article in ACHR The News on why HVACR contractors are a natural fit for, and shoulddominate the home performance market: Home Performance Contracting: Our Next Great Opportunity.…Continue

Tags: energy, efficiency, audit, retrofit, house

Started by Leslie McDowell, BPI Oct 6, 2011.

Historic Home Radiant Hot Water 2 Replies

I am modeling a home this week that was built in 1927. Heated (CZ 4) with a 1927 coal fired boiler that was converted to NG in the mid 1960s. AC is 2 units one for each floor. The basement is…Continue

Started by John Nicholas. Last reply by Bill Bradbury Jul 10, 2011.

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Comment by Steven Lewis on December 17, 2011 at 11:55am: You havent given enough information to make an educated guess. How dusty was the house before? Is it in all rooms or just a few. is it dust or fibers from the cloth materials in the home. If you can sweep your hand across a surface and the materiall rolls up it is fibers and is probably not coming from the duct work

Take a camera and shoot some pictures down the duct or runs and that will show you if something is in the duct system as well. What type and efficency filter is the homowner using? You might check the returns and see if there are any openings to the outside of the envelope .

when you gave "more air" how did you do that?

Comment by Judi Lyall on December 17, 2011 at 6:42am: Good morning,

I have a client that complained that certain rooms were either cold or hot. She had 45% leakage. We gave her more air, tightened the ducts and now she called and said that the home is now getting very dusty. What is the cause and what to do next. It has gone through the summer with the air blowing thru it, I would think the the dust in the ducts are already blown out

hanks for your reply

Comment by Al Tibbs on February 3, 2011 at 11:20pm: When will the ICC Codes prevent the installation of air handlers and ductwork in unconditioned attics. This practice is the biggest obstacle to achieveing the best results when retrofitting.

Comment by John Nicholas on December 31, 2010 at 10:02am: I went out to get the mail this morning and saw my neighbor's roof. The attached image shows what I am thinking is ice, frost on the roof. It is obviously circular around the flue from the furnace. The flue from the DHW is separate and not in the image. It was frosty this morning and overcast. At 8:30 most roofs have frost. By the time I noticed this and took the shot, the frost on the other roofs is gone.

Is this excessive condensation from moisture in the flue gases and does that mean the furnace has a problem?

Roof.JPG

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