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  1. Replies
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    I have the top of the line Cor stat but not the...

    I have the top of the line Cor stat but not the Infinity with the TrueSense dirty filter detection.

    I just cleaned my ERV filter, (first time in 6 months of operation). Super nasty, they weren't...
  2. Replies
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    382

    Each furnace only has the one bag filter. One is...

    Each furnace only has the one bag filter. One is 24x24x22 (8-bag), the other 12x24x22 (4-bag). MERV 11. See attached photos. 8-bag is on main level, gets more AC use. 4-bag is on lower level, getting...
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    Reply to HRV Exhaust Vent by lekinv

    I could not reply directly on the thread, below. I had the same ERV issue. I have one ERV hooked to two furnaces. The ERV's 100 cfm cannot push enough air through a regular duct system (5000 sq ft)....
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    382

    When to replace bag filters?

    I have two furnaces with Airguard bag filters. My first experience with bag filters. The filters have been in since the house was completed seven months ago. I check them every month. The first sign...
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    447

    I have a humidifier, not currently activated and...

    I have a humidifier, not currently activated and in the summer position, would that qualify as the bypass? Thanks.
  6. Replies
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    447

    From page 5 of the installation manual for Lennox...

    From page 5 of the installation manual for Lennox SLP98V. Two somewhat conflicting statements on same page. One indicates can setback to 55 at night, the other statement says never below 60. Thanks. ...
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    In this scenario, neither of those options is...

    In this scenario, neither of those options is feasible. We do have freezing temps (cold edge of Zone 4).

    I have a vacant home for sale. Maybe one showing or open house every week or two. No need...
  8. Replies
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    447

    Minimum Set Temp for Direct Vent Furnace

    From what I understand, direct vent furnaces should be kept at a minimum of 60* to prevent condensation & corrosion. For a vacant home, does it need to be at 60* all the time, or can a program be set...
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    444

    I'm not sure. I thought it was to have fresh,...

    I'm not sure. I thought it was to have fresh, healthy air. I don't care if it costs me an extra $150 per year in electricity; I have a 12kWh PV system. We occupied in May. Windows were usually closed...
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    444

    If I remember correctly, COR only lets you adjust...

    If I remember correctly, COR only lets you adjust fan run times per hour, but I don't use that since I need 24/7. The fan runs pretty low, I assume at the slowest speed possible. Thanks.
  11. Replies
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    Complicated HVAC System

    New construction, cold edge of Zone 4. Been in for six months. Reverse 1.5 with finished lower level walkout. HVAC system for each level. All mid to upper level Carrier. About 2300 conditioned sq...
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    Does the Ultra-Aire duplicate the ventilation...

    Does the Ultra-Aire duplicate the ventilation function of the existing ERV?

    Can the Ultra-Air be teed to dual furnace/AC systems as is the ERV?

    I have about 2300 sq ft of conditioned space on...
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    465

    Is my ERV setup operating correctly?

    New construction, cold edge of Zone 4. I had the guy come by today for the HERS evaluation. He tested the ERV. It is only moving 13 cfm. Blower door has me at 2.2 ACH. HERS computations say ERV...
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    401

    Mount AC on brackets or pad?

    New construction. Should contractor mount Carrier 24ACB7 3-ton & 2-ton AC units on brackets or pads? I think they're 32" x 32". See photo. They are on side of house at the back and won't really be...
  15. Replies
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    987

    Manual J

    Attached
  16. Replies
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    987

    Yes, 60,000 to heat basement. The 50% framing...

    Yes, 60,000 to heat basement. The 50% framing lower level is all windows in back, no windows on sides. Maybe 75% of LL framing is windows & patio doors.
  17. Replies
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    987

    I asked about using one system and zoning it. He...

    I asked about using one system and zoning it. He said would cost as much money as two systems or more. Better to have a backup system in case one goes out.
  18. Replies
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    987

    The contractor finally relented and did a Manual...

    The contractor finally relented and did a Manual J for a few hundred dollars. It saved me a couple of thousand dollars as the two sets of equipment were reduced in size:

    Main Level - 100,000 >...
  19. Replies
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    Whether we go independent ducting or join in the...

    Whether we go independent ducting or join in the main level furnace system ducts, we're looking at Carrier ERVXXSHB1100 (100 cfm) or ERVXXLHB1200 (200 cfm). If I understand the contractor correctly,...
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    It's 4300 sq ft, 2300 + 2000.

    It's 4300 sq ft, 2300 + 2000.
  21. Replies
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    1,163

    Dedicated ERV Ducting

    New construction. Two level/two system home including walk-out basement. 2300 finished on main and 2000 finished on lower. Contractor proposes one ERV for main level system hooked to gas furnace/AC...
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    987

    Proposed System Seems Oversized

    Cold edge of midwest Zone 4. 1% Cooling Limit = 93F; 99% Heating Limit = 5F. New construction. Reverse 1.5 with walkout basement, about 50/50 concrete/framing on LL; main is all wood framing....
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    That link didn't work, but I think this is what...

    That link didn't work, but I think this is what you were refering to:

    https://energydesignresources.com/media/1717/EDR_DesignBriefs_designdetails.pdf
  24. Replies
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    738

    I got 160 views but no replies; giving it one...

    I got 160 views but no replies; giving it one more try. Thanks.
  25. Replies
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    Building a new house in midwest, presumably...

    Building a new house in midwest, presumably reasonably tight. Does letting the dog out every 3-5 hours during the day and maybe a delay to 7-8 hours overnight qualify as sufficient air change? ...
  26. Replies
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    738

    Furnace offset from trunk?

    New house on border of Zone 4/5. Reverse 1.5 with one HVAC system for each level located in basement. About 2000 sq ft on each level. Trunk is about 65 ft, split about 40 ft/25 ft. Because of a...
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    Yes, my GC allows me to use my own subs if I...

    Yes, my GC allows me to use my own subs if I don't want to use his. I'll try and use his unless there is a reason not to. I'm not confident in the two HVAC subs. The attitude seems to be "don't...
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    3,151

    We have one Lennox Commercial Distribution Center...

    We have one Lennox Commercial Distribution Center & two Lennox PartsPlus locations in the metro. There are over a dozen "Dave Lennox Premier Dealers." Does that mean nothing to worry about keeping...
  29. Replies
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    Lennox Parts Availability

    Cruising the web, I see a lot of comments about Lennox having proprietary parts while nearly everybody else uses generic, interchangeable parts. Comments indicate Lennox parts are therefore more...
  30. Replies
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    854

    Fuzzy estimates on new construction

    Custom building a new house. Had two estimates from subs that the builder uses. Both just give a sum total with a general description of the equipment, brand but no model numbers and little or very...
  31. Replies
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    New build design questions

    Building a new house in Zone 4.5 (on the border of Zones 4 & 5). Reverse 1.5 story with finished walkout basement. Main level 2300 sq ft; lower level 2000 sq ft. Should I be looking at one HVAC...
  32. Replies
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    Cottonwood Seeds Smothering AC Unit

    I have a new Lennox XC14. Soon, we will be flooded with cottonwood seeds. My AC condensing unit gets a heavy blanket of these white cottonballs. I've seen some people wrap window screens around...
  33. Yes, new Lennox XC 14 & coil. Believe the same...

    Yes, new Lennox XC 14 & coil. Believe the same size as old AC. Tomorrow will be first use as tech is coming to check it since it was installed in December without full testing. Have iComfort WiFi...
  34. Old & new systems run on AUTO. Pretty sure I...

    Old & new systems run on AUTO. Pretty sure I have the 1/2 HP fan, not the 3/4 HP. Don't know what the old furnace had.
  35. The meter numbers I am using are net, after all...

    The meter numbers I am using are net, after all the back & forth.

    Usually, the fan runs so low, it's hard to tell if it's running.
  36. Don't really remember the sales specifics, but I...

    Don't really remember the sales specifics, but I seem to recall both comfort & energy savings. I doubt my gas savings is much as I went from about 92 to 98 AFU, but I still need to check that. I'm...
  37. The house was built in 1905 and the ducting seems...

    The house was built in 1905 and the ducting seems to be of various generations and materials, to include wood return ducts. While only a one-story house, the basement is finished and some ducting is...
  38. New VSM uses more electricity than 15-year old single-speed fan furnace

    I have a Lennox Signature 98V gas furnace that was installed in December. It seems to be using an excessive amount of electricity. While hard to quantify exactly on a casual examination, I do have...
  39. Thank you, I decided to get the Elite.

    Thank you, I decided to get the Elite.
  40. Maybe I wasn't clear with my question. I've...

    Maybe I wasn't clear with my question. I've already selected the installer and he is NOT the lowest bidder. It's just a question of the price difference between two models being worth x amount. ...
  41. I know we're not supposed to discuss price, but I...

    I know we're not supposed to discuss price, but I did see this same question asked 8 years ago for a much larger price difference, which was allowed.
    ...
  42. OK, decided on all new equipment: Lennox...

    OK, decided on all new equipment: Lennox Signature 98v, new coil & condenser. Only question is 14ACX vs 14XC1. What does the "compressor high & low pressure protection" mean and does that make it...
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    I had bids from three comparable companies. I...

    I had bids from three comparable companies. I think I'm going to stick with our current company which I lists some but not all of this stuff anyway. Only this one other company listed some of the...
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    972

    Installation Marketing Hype?

    One of the bids I received for a new furnace, coil & condenser contained the following boilerplate language. Can you tell me which of these are basically standard procedure, which are unusual but...
  45. Replacing furnace; should I also replace working (but old) AC

    Replacing 16 year old York furnace. Should I also replace working 16 year old 2.5 ton Goodman CKJ30-1A & coil. Not sure about the coil as coil case lists a York product.

    While old AC is Seer 12...
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    1,168

    Not sure where my edit button went for the...

    Not sure where my edit button went for the previous post. I meant heat exchanger, not burner. Not sure if that means the same thing.
  47. Replies
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    After I complained, the company sent my regular...

    After I complained, the company sent my regular tech back out so I am happy with that. The first "tech" didn't open the burner cover to visually inspect the burners. The regular tech did inspect...
  48. Well, I had three Lennox contractors come out. ...

    Well, I had three Lennox contractors come out. Two of the three are Dave Lennox Premier Dealers (whatever that means) and the other is a Service Experts Company, which from what I'm told is owned by...
  49. As I said in my original post, my house is 1200...

    As I said in my original post, my house is 1200 sq ft on one level plus a smaller finished basement. Current furnace is 93,000 BTU single-stage. One contractor recommended a 90K furnace because...
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    545

    To Humidify or Not Humidify

    Getting a new furnace. Currently have a 16 year old AFUE 92 single-stage. Leaning towards a Lennox Signature 98V; VS & modulating. The humidifier question has risen. In my last house, I had a circa...
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