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  1. Replies
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    I can hardly believe a 5 ton A/C works on a 24X24...

    I can hardly believe a 5 ton A/C works on a 24X24 RA grille. Not to mention the restriction at the filter. Are you sure the unit is 5 tons?
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    First, 3.5 ton for

    First, 3.5 ton for <1,700 sq. ft. is probably oversized. Second, the ductwork shown is too small for a 3.5 ton system.
  3. It could be the airflow. Your furnace might be...

    It could be the airflow. Your furnace might be 'bumping' the limit. Check the filter.
  4. 2,100 sq.ft. with a 3.5 ton A/C? Do you live in...

    2,100 sq.ft. with a 3.5 ton A/C? Do you live in Texas? Where is the oval duct? P.S. I hate oval duct…….it doesn't carry the air that a 6" round will, probably closer to half the airflow.
  5. The 6" oval is where most of the restriction is...

    The 6" oval is where most of the restriction is taking place. I'll write more later, when I return.
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    Around here (Iowa) a 2 ton or a 2.5 ton will do a...

    Around here (Iowa) a 2 ton or a 2.5 ton will do a 2-story home, depending on the insulation, etc. Now you're dealing with hotter and more humid weather, but I would think a 3 ton would be more than...
  7. The VS (variable-speed) blower will give you...

    The VS (variable-speed) blower will give you better de-humidification capabilities in the summer with the right thermostat.
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    My guess would be that you're already pulling...

    My guess would be that you're already pulling return air from the basement through leaky ductwork. With the fan on or the system running (give it time to create a negative), go to the top of the...
  9. I don't know of any 2.5 ton 2-stage A/C units.

    I don't know of any 2.5 ton 2-stage A/C units.
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    You probably have a leak in the coil that's on...

    You probably have a leak in the coil that's on the furnace. That is common weak area for leaks. You can just have that replaced and reuse the existing condenser (outdoor unit) if you want to keep...
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    It's an air handle and not a furnace, correct? ...

    It's an air handle and not a furnace, correct? Are you having problems with the inside unit or the outside unit? Did they say why it wasn't cooling?
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    Five (5) ton systems require a lot of airflow. ...

    Five (5) ton systems require a lot of airflow. You need someone that really knows what they are doing, particularly if zoning is being added to the system.
  13. Once you properly size the equipment, install a...

    Once you properly size the equipment, install a 2-stage or better furnace with the VS blower, 95% of the heating problems to the 'slab' room go away. I would also suggest adding volume dampers in...
  14. Yes, the VS blower has many advantages. You will...

    Yes, the VS blower has many advantages. You will not be disappointed, unless the ductwork is very limited (as mentioned previously). But, if the ductwork is insufficient, it needs to be corrected...
  15. A older 140,000 Btu furnace would have a 6"...

    A older 140,000 Btu furnace would have a 6" (maybe 7") draft diverter and vent. Can you imagine how many air changes his home has in a 24 hour period?

    I used to have some information on that...
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    The downstairs is short of return air at the...

    The downstairs is short of return air at the grilles and it could be worse depending on the ductwork. The 3rd floor return is okay at the grilles, but again, it also depends on the ductwork going to...
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    I vote for transfer grilles. One high and one...

    I vote for transfer grilles. One high and one low. It's the most cost effective way to do it. How many and what sizes are the returns in the house now? What size is you A/C?
  18. Congratulations, you're smarter than your HVAC...

    Congratulations, you're smarter than your HVAC guy. You are so correct. Your system is really, really short of return. This is a very common and overlooked problem in our business. i'm surprised...
  19. Why anyone would have run 5" supplies is beyond...

    Why anyone would have run 5" supplies is beyond me. Anyway, part of the airflow restriction may be at the register themselves. Try taking a register off and see if there is an airflow improvement. ...
  20. Where else will you find a 20%, tax free return...

    Where else will you find a 20%, tax free return on any investment. Not to mention improving your comfort, as mentioned previously.
  21. The 14" flex from box A to box B is too small...

    The 14" flex from box A to box B is too small even for a 3 ton unit. The A/H is so far away from the master bedroom that even with increasing the duct size it will be hard to cool that area without...
  22. Is the room on the slab included in the 1,400 sq....

    Is the room on the slab included in the 1,400 sq. ft. home size or is it in addition to the 1,400 sq. ft.? What are the sizes of the 4 supplies to that room? There are no dampers in the trunk or...
  23. Yes, I agree. Not to mention the (2) 2x4's that...

    Yes, I agree. Not to mention the (2) 2x4's that are blocking the already small filter. I prefer a larger 'box' filter on units 3.5 ton on up.
  24. Energy Rater gave me an idea……….if you could...

    Energy Rater gave me an idea……….if you could spare a small corner of your foyer, consider a separate 2 ton A/H in a newly constructed closet. Tie the new A/H into box E and box C.

    The existing...
  25. Is there room in the attic for the A/H? I prefer...

    Is there room in the attic for the A/H? I prefer keeping the A/H in the conditioned space (as yours is), however, it is not centrally located.

    Having your A/H so far from the master bedroom (end...
  26. They've had 5 companies come to bid the work. ...

    They've had 5 companies come to bid the work. I'm assuming they used references, factored the size of the companies, considered the reputation and were influenced by commercials when choosing the...
  27. I just reviewed the duct lay-out. I don't...

    I just reviewed the duct lay-out. I don't believe what I'm seeing, incredible. I can't imagine how your A/C has operated so long.

    Is the A/H in the house or the attic? I can definitely see...
  28. I forgot how to do what you did with answering...

    I forgot how to do what you did with answering each quote. That's neat.

    I did not look at the ductwork lay-out but I will. Installing the better insulated flexible ductwork is much less...
  29. Thank you for saying it so well. We don't mean...

    Thank you for saying it so well. We don't mean to upset anyone here.
  30. If your 3.5 ton has been doing the job for 20...

    If your 3.5 ton has been doing the job for 20 years, I would say that your Manual J numbers are incorrect. Your A/C has lost some cooling capacity after 20 years.

    I would suggest that you...
  31. This is not a DIY site.

    This is not a DIY site.
  32. Thread: Filter Size

    by George2
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    No problem……….it's a easy mistake.

    No problem……….it's a easy mistake.
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    It depends on the manufacture, but the size...

    It depends on the manufacture, but the size needed with a 95+AFUE furnace will be between a 60,000 and 70,000 btus input. A nice furnace on a budget would be a single or 2-stage with a X13 (hi-eff.)...
  34. You got me!…………boy, I was sleeping! That's worse...

    You got me!…………boy, I was sleeping! That's worse than Obama saying we have 52 states.
  35. Replies
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    You have the option of running the blower 24/7. ...

    You have the option of running the blower 24/7. The blower will operate just like the one you have now. You can run your existing blower 24/7 if you want to. You may want to run the blower at...
  36. I'm guessing……..33rd month, 1965?

    I'm guessing……..33rd month, 1965?
  37. Replies
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    In one of your posts you mentioned a single-speed...

    In one of your posts you mentioned a single-speed ECM (blower) furnace. You want a variable-speed ECM blower, not a X13 ECM blower. There is a huge difference.

    If you can not A/C the 2nd floor...
  38. Replies
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    I believe your ductwork will be okay for the VS...

    I believe your ductwork will be okay for the VS blower. Sidebar: The X13 is also a ECM motor but it is not VS. I think you should go with the VS blower. With the right thermostat, they'll ...
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    Okay, thanks for the additional information. I...

    Okay, thanks for the additional information. I agree with you, it can be very confusing because the salesmen all have their own opinion and most of the time they don't have the correct facts. ...
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    Do you have A/C now or are you planning on adding...

    Do you have A/C now or are you planning on adding A/C? A 2-stage furnace will be your best bet. If the basement is open, the the return air ductwork needs to be re-routed to quiet the airflow to...
  41. Replies
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    It sounds like an old gravity conversion. The...

    It sounds like an old gravity conversion. The main reason for the air noise is the one return right above the furnace. Are the 12"x14" supplies on the inside walls?
  42. Replies
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    The only return air is in the basement? ...

    The only return air is in the basement? Something is amiss. A better description of the ductwork and/or pictures would help.
  43. If you only have the two (2) returns, then your...

    If you only have the two (2) returns, then your system is short of RA. Where are the 3rd floor registers? In the ceiling or the floor? More than likely, your problems are ductwork related.
    ...
  44. Thread: Duct runs

    by George2
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    373

    A supply register or a diffuser has a designed...

    A supply register or a diffuser has a designed throw based on the cfm. So it will depend on the room size, windows and were you want the air to go.
  45. No, it is not sufficient. Your HVAC guy is not a...

    No, it is not sufficient. Your HVAC guy is not a professional.
  46. If the ductwork went two different ways, in other...

    If the ductwork went two different ways, in other words, the duct ran to the front of the furnace and towards the back of the furnace, that would provide enough return air. Then it comes down to how...
  47. Replies
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    A furnace blower moves X amount of air. The...

    A furnace blower moves X amount of air. The filter rack is basically the size of the opening on a (small) furnace. Sidebar: I'm only talking about your set-up, not to get too confusing. Larger...
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    If you're not get a high efficiency 'box' filter,...

    If you're not get a high efficiency 'box' filter, then make sure they use a new 16"x25" 'drop' and filter rack. If a 20"x25" 'drop' is available, that would be better. But a 16"x25" is fine for a...
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    Regarding the filter size they are offering; it's...

    Regarding the filter size they are offering; it's 20% smaller than any furnace manufacture recommends. The contractor is using a less expensive 'drop' that has the smaller filter.

    There is a...
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    It would be nice if you could read his writing. ...

    It would be nice if you could read his writing. I love those preform proposals. Nothing said about labor, permit or taxes. I guess you have to trust them. I do not like the 16"x20" filter one...
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