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  1. Replies
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    Did not know I needed to be contractor to...

    Did not know I needed to be contractor to purchase HVAC insulation HD and Lowes sell "junk" in my opinion. Just looking for the type / manufacturer if you could help out. Not looking to break any...
  2. Replies
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    271

    Ductwork Insulation

    Hi Everyone,

    I am doing a small amount of duct sealing (some seams where not sealed and or came apart) and I am looking to replace a bit of the outside insulation. The insulation currently...
  3. Replies
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    1,249

    I am hiring a pro, however I have had several to...

    I am hiring a pro, however I have had several to the house for a quote and each one has a different approach and they are not 100% sure. This is why I am trying get a consensus on the best approach.
  4. Replies
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    1,249

    I am sorry but I dont understand your response. ...

    I am sorry but I dont understand your response. My largest zone is the first floor with 8x20. So you are saying insert an 8x18 instead and connect it where?
  5. Replies
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    Thank you for the information. So it sounds like...

    Thank you for the information. So it sounds like the preferred method is a motorized SP bypass damper tied to a SP switch rather than the 25-30% oversizing of the ductwork? My contractor says the...
  6. Replies
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    1,249

    Plenum Sizing with Variable Speed Furnace

    Hello,

    Sorry in advance for the lengthy post.

    Currently have Nat Gas 90% AFU furnace that is 12+ years old and was way oversized for the house (120k BTUh vs 75k BTUH with 20% oversizing) so I...
  7. Thread: Load Calcs

    by lkaufman
    Replies
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    468

    Hi Everyone, The existing furnace is singe...

    Hi Everyone,

    The existing furnace is singe stage 120KBTUH at 91% or 112K BTU

    The furnace was constantly short cycling. In looking at the ductwork, it appears to have been sized for a 70-75K...
  8. Thread: Load Calcs

    by lkaufman
    Replies
    4
    Views
    468

    Load Calcs

    Hi Everyone, wanted to bounce some numbers of off the professionals.

    Getting ready to replace furnace. Did my own heat load calc using the tool discussed on this site, with 20% factor came to 70K...
  9. Replies
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    1,374

    Thank you for the reply. So it does sound doable...

    Thank you for the reply. So it does sound doable with a zone controller and the proper 2 stage stats? Sound like the key is sizing the main trunk for that zone to the cfm of the blower on low fire...
  10. Replies
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    Furnace Replacement

    Hi Everyone, I am getting ready to replace my furnace and had a few questions about what I would like. I have 3 contractors comming over but wanted to get the pro's opinion. Did a manual J and have...
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    Thanks. I had 2 companies come out an look at...

    Thanks.

    I had 2 companies come out an look at the unit. Basically they both said the same thing, although 1 wanted to try to reduce the gas pressure from 3.5" to 3.2" to see if this would help as...
  12. Replies
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    789

    you are 100% correct, no way I am looking to...

    you are 100% correct, no way I am looking to derate that much. My contractor is working the numbers with armstrong but he is thinking if he can de-rate 20% that should put my temperature rise to...
  13. Replies
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    789

    Thank you for the reply. I fully understand that...

    Thank you for the reply. I fully understand that you can not and won't provide DIY help. I am in no way looking to do something like this myself, in fact the contractor that I had come and look at...
  14. Replies
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    789

    Furnace Issues

    Hi Everyone,

    In know this is not an DIY site but wanted to get input after speaking with several contractors. To make a long story short, about 6 years ago 125K BTU Armstrong 91% furnace was...
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    2,994

    Thanks, how far down the trunk line should I...

    Thanks, how far down the trunk line should I check? I did check the name plate and it says 75F max rise. Since the furnace was installed I have known they undersized the ductork, cuasing the higher...
  16. Replies
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    2,994

    temperature rise in furnace

    Checking out the furnace and I took some temperature readings, at the discharge, about 24" above the burners, I was reading 162F, inside the return air cabinet at the blower (with the door closed) I...
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    732

    I was simply thinking of the basics ignitor,...

    I was simply thinking of the basics
    ignitor, blower and induced draft motor
    the tech said the ignitor is off the shelf but the blower (5 speed) and induced draft motor are not "standard" and take...
  18. Replies
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    732

    My tech is pretty good but he did say the parts...

    My tech is pretty good but he did say the parts usually take 1-2 days to get in and then the install. So I am considering getting some spare parts as I do have small kids in the house and going...
  19. Replies
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    Armstrong Ultra 91

    Hello, I have a 125KBTU natural gas furnace that is 10 years old. The furnace has given me no problems in the last 10 years, maintenance has been performed regularly.

    My service tech said what...
  20. Thread: Mr Slim

    by lkaufman
    Replies
    13
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    1,344

    HI EverettsHVAC, I do have the operational and...

    HI EverettsHVAC,

    I do have the operational and service manuals. You are correct, it only has a timer (run from 10-2 lets say), however I can not perform setback functions and on/off at different...
  21. Thread: Mr Slim

    by lkaufman
    Replies
    13
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    1,344

    iraqveteran, thanks. I have also looked at the...

    iraqveteran, thanks. I have also looked at the manual and the only control wiring that I can see is to the outdoor condenser, it appears that the unit has an IR board that is controlled by the...
  22. Thread: Mr Slim

    by lkaufman
    Replies
    13
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    1,344

    The model is Mitsubishi MSH15TN and the serial is...

    The model is Mitsubishi MSH15TN and the serial is 3000974.

    Thanks for the help.
  23. Thread: Mr Slim

    by lkaufman
    Replies
    13
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    1,344

    iraqveteran, thank you

    iraqveteran, thank you
  24. Thread: Mr Slim

    by lkaufman
    Replies
    13
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    1,344

    Hi Everyone, Some assistance would be most...

    Hi Everyone,

    Some assistance would be most appreciated.

    Thanks in advance.
  25. Thread: Mr Slim

    by lkaufman
    Replies
    13
    Views
    1,344

    Mr Slim

    Hello,
    I have a Mr. Slim ductless heat pump MSH15TN. The unit has a remote control for operating heating/cooling, vane position, etc. Is there a way I can connect a setback thermostat to the unit?...
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    FHA Furnace Ductwork

    Hello,

    I have a 2 story colonial with basement. In the basement is a 3 zone FHA furnace (first, second and future basement zone). I recently cut a hole in the door from the first floor to the...
  27. Replies
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    Mitsu Mini Split

    Hello,

    We have some really hot days ahead and I just wanted to make sure my 17,000 BTU/H minisplit is functioning. Presently it is about 91 degrees outside, the unit is pushing out air at 49...
  28. Thread: Noisy Duct

    by lkaufman
    Replies
    9
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    853

    Hi Dash, The best way I can explain the noise...

    Hi Dash,

    The best way I can explain the noise is it sounds like a vibration or humming sound. At the fan itself which is in the basement, there is minimal noise and no vibration. The only thing I...
  29. Thread: Noisy Duct

    by lkaufman
    Replies
    9
    Views
    853

    Thanks for the input. I do have metal low...

    Thanks for the input. I do have metal low restrictive floor registers.

    My big questions is the 3x12 duct the culprit or the flex. I can get to the flex much easier to replace than the 3x12 which...
  30. Thread: Noisy Duct

    by lkaufman
    Replies
    9
    Views
    853

    Thanks for the reply. 1) Already done, found a...

    Thanks for the reply.

    1) Already done, found a few leaks, repaired with duct mastic.
    2) There is a return in the room.
    3) Used IR temp meter and walls, ceilings, windows, etc are in good shape....
  31. Thread: Noisy Duct

    by lkaufman
    Replies
    9
    Views
    853

    Noisy Duct

    Hello Everyone,

    I have a FHA furnace serving a 2,400 square foot 2 story house. The furthest bedroom on the second floor was a bit cold and when I checked it was the last take-off on the main...
  32. Replies
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    563

    Thank you. I just wanted to make sure the...

    Thank you. I just wanted to make sure the electric heat would work with the high duct temperature of gas heat. Is there a particular brand that I should be looking for? It is a 7" diameter metal...
  33. Replies
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    563

    In Duct electric Heat

    Hello, after a recent room renovation in which a window was added, there is inadequate heat to keep the room comfortable. As all of the ductwork is run in walls can an in-duct electric heater be...
  34. Replies
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    1,542

    Vision Pro Stat Question

    Hello, I have several Vision Pro Stats (single stage heat/cool). I wanted to circulate a bit more air thru the hose for more even temp. Just wanted to confirm that the "circ" mode will operate the...
  35. Replies
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    633

    Hello, I have a honeywell vision pro single...

    Hello, I have a honeywell vision pro single stage stat on my gas furnace. One of the upstairs bedrooms, the furthest, is a bit cold. I have had this checked out and it appears that they slightly...
  36. Thread: Heat Pump

    by lkaufman
    Replies
    2
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    638

    I have a Mr. Slim Heat Pump and was wondering: ...

    I have a Mr. Slim Heat Pump and was wondering:

    Outside is 45 F, Inside is 67 F and discharge air at the heat pump is 96 F. Is this temperature differential ok? I was told the discharge temp...
  37. Thread: Return Air

    by lkaufman
    Replies
    10
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    930

    Hi Dash, The upstrairs hall connects all of...

    Hi Dash,

    The upstrairs hall connects all of the bedrooms as well as the stairs leading to the first floor.

    Yes, basement with first and second floor. Problem bedrooms is on second floor with...
  38. Thread: Return Air

    by lkaufman
    Replies
    10
    Views
    930

    Hi Dash There are 4 bedrooms, each has a...

    Hi Dash

    There are 4 bedrooms, each has a panned return 3.5x14 down to the main trunk in the basement, with the exception of the one room in question. Each has a 6x12 floor register.

    The system...
  39. Replies
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    748

    Hello, No as far as I can tell there are no...

    Hello,

    No as far as I can tell there are no openings. Could this be a duct leak?

    Thanks
  40. Thread: Return Air

    by lkaufman
    Replies
    10
    Views
    930

    Unfortunately Not, there is no main return in the...

    Unfortunately Not, there is no main return in the 2nd floor hallway. Just in each individual room (less the room we are talking about).
  41. Thread: Return Air

    by lkaufman
    Replies
    10
    Views
    930

    Hi Dash, Unfortunately I could only do either...

    Hi Dash,

    Unfortunately I could only do either a transfer grill or underfloor connection to the adjacent room with a single 3.5x14 (paned) return. The room is on the second floor on one side of...
  42. Replies
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    748

    I believe the air is coming up from the basement...

    I believe the air is coming up from the basement and not from the 1st floor to the basement? I can check this with a lighter. Any other thoughts?
  43. Replies
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    748

    Hello, have a 2 story house plus basement. FHA...

    Hello, have a 2 story house plus basement. FHA 92+ furnace in the basement with 2 zones (first and second floors). No supply or return in basement. When either of the zones calls for heating or...
  44. Thread: Return Air

    by lkaufman
    Replies
    10
    Views
    930

    HI Dash, The room warms up too much with the...

    HI Dash,

    The room warms up too much with the door closed leading me to believe that there is no return path. With the door open, it is comfortable.

    The reason that I wanted to tie the smaller...
  45. Thread: Return Air

    by lkaufman
    Replies
    10
    Views
    930

    Hello, I had a new house built about 3 years ago....

    Hello, I had a new house built about 3 years ago. FHA with A/C, 2 Zone. For the most part the FHA works well. All of the bedrooms have their own floor mounted RA. The way it was designed is the...
  46. Replies
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    1,455

    What brand to you guys use? Please dont say...

    What brand to you guys use?

    Please dont say the home center special?
  47. Replies
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    1,455

    how would you staple in a circle. There has to...

    how would you staple in a circle.

    There has to be special vinyl tape of sorts that you pro's use?
  48. Replies
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    1,455

    I hate to use the foil stuff on gray colored...

    I hate to use the foil stuff on gray colored vinyl insulation. I have tried all kinds of duct tape, the last roll I bought was $8. Any help would be appreciated.
  49. Replies
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    1,455

    Hello, A few weeks ago I had a service call to...

    Hello, A few weeks ago I had a service call to repair a zone damper. The tech new his stuff, removed and repaired the damper. All is working fine. The only problem is were he removed the damper,...
  50. Thread: Duct Size

    by lkaufman
    Replies
    10
    Views
    1,006

    Thank you. I think I am getting things confused....

    Thank you. I think I am getting things confused. When I say return at the filter I am not refering to the grilles in the room. Let me try and ask my question in a different manner so you Pro's can...
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