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Sorry about that... I knew better but wasn't thinking.

Last year we spent about $ for a Lennox SLP98UH110V6OC (106,000 BTU/h output, 97.5% AFUE), Lennox XC-16 (2-stage AC ~17 SEER), AprilAire 1750A (whole house dehumidifier), plus a basic humidifier and...

I've just read a recommendation at another HVAC site to a similar question regarding the heating of a small baseboard zone where DHW is supplied by an indirect hot water tank.

The person making...

I own a 2-story colonial with a finished walkout basement, located about 10 miles SE of Philadelphia, PA. The 1st and 2nd floor is forced-hot-air heated by a condensing, gas furnace that was...

I will have a tankless gas water heater installed (e.g., Rheem EcoSense 7.4 GPM gas unit).

Regarding the cost effectiveness (or ineffectiveness) of heating the entire home with a mod/con gas...

The current cost of a CCF of natural gas from PECO (my supplier in suburban Philadelphia) is about $1.25 -- which equates to approximately $1.21 per 100,000 BTU.

The current cost of a gallon of...

Yes... I've learned that they're all planning 2-pipe venting systems.



The quote for the chimney liner was $2,100 -- not "several thousand". It seems I can buy a 6" x 35 foot, 316ti stainless...

The 109,000 BTU (DOE Heating Capacity) Thermo-Dynamics HT-1 oil boiler heats only the finished basement and laundry room (about 750 sq.ft.) and supplies all the hot water (washing, cooking, etc.).
...

I agree that the load calc (blower door, manual J & D) done by Company C is flawed -- perhaps to the point of being no better than the load calcs done by Companies A, B and D... which were based...

amd,

The Company C guy who did the load calc is well aware that his 73,186 heat loss figure does not comport witb the OTHER Company C guy's recommendation of a 135,000 BTU furnace... and when last...

tedkidd,

Can't do radiant heat as all the flooring (except in the basement) is original hardwood.

I like the idea of a single boiler... the problem with this approach, however, seems to be...

tedkidd,

I'll talk with the Company C rep concerning comparative CFM rates for the 90,000, 110,000 and 135,000 BTU Lennox SLP98UH furnaces, and how those rates impact the size of the furnace to...

samtheman,

I understand you point regarding a 2nd floor return, and have been told by a the Company B, C and D reps that the 2nd floor will be 6-7 warmer than the 1st when running the new central...

hivacer,

My original plan was to replace the old oil furnace with a high-efficiency gas as well as to replace the old central AC.

This would get me a $1,500 federal tax credit plus a $1,000...

hearthman,

Thanks for the info regarding dual-piping a CAT IV. The Company C guy said they DO use a separate intake and exhaust pipe for all CAT IV installations. (Seems as if all the companies...

amd,

The Elite Software (generated) Home Energy Audit report resulting from the Manual J and D and blower door test conducted by Company C says only this about insulation:
• Attic Insulation...

:CU: Just now, I don't have time to respond to the nine posts that have followed my last post from 08/19/2010 at 02:13 PM.

However, I want to put this into the mix... (reminding all that there's...

:CU: At this point… I believe the Chimney Liner issue has been answered (thanks, hearthman). That is… subsequent to a chimney inspection and sweeping, a 316 Ti stainless steel liner should be...

amd,

I agree about "building [the] envelope"... and will make that an ongoing project - but doesn't it make sense to convert from a 20+ year old oil furnace to a 95+% AFUE condensing gas furnace...

tedkidd,

I agree with your thinking that 250,000 BTUs sounds like a lot...

I should have initially mentioned that there is a 3rd floor loft open to a cathedral ceiling'd 2nd floor bedroom......

hearthman,

I believe you've NAILED the issue of the chimney liner... and I appreciate your thorough post.

As I mentioned in my reply to Fabrk8r...

"Yesterday, a chimney sweep swept and...

hivacer,

Regarding converting to a gas condensing boiler... I'll just cut-and-paste what I wrote in reply to samtheman - who has the same idea:

"Your idea of installing a high-efficiency gas...

ampulman,

Yes... Swarthmore.

I mentioned in my original post that, [Company C] "did an Manual J, Manual D and blower door test"... at least they say they did a Manual J. What they did do is a...

samtheman,

Yes... the type of construction and floor plan make it near impossible to install 2nd floor returns or new supply ducts (for either heat or AC)... and I've already been told by two of...

Fabrk8r,

While all four companies realized the problems resulting from a lack of 2nd floor returns... each company recognized the difficulty of installing any 2nd floor returns, owing to the...