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  1. Got it. Basically inefficient energy hawg. 😏

    Got it. Basically inefficient energy hawg. 😏
  2. Difference between high velocity, and regular air handler?

    This question is in reference to what makes a system high velocity besides the small ducts?

    Is it the fan, and airhandler cabinet design?
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    convective tempering

    Sounds high tech don't it. I was going to suggest that, but it sounded like you spray foamed the cantilevered floor joist area. It would help upstairs, but may draw cold into the basement.

    I...
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    Air tight bump outs

    I agree that not enough detail is given to the bump outs. Builders figure no one goes in there so waste of time to make it draft free.

    But with that said, and if you do all you can to make it...
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    Hearthman is totally correct

    It should be asked what side of the house is the chase on. Is its North, west, or northwest prevailing windage will find its way into the smallest gaps in the chase. Fiberglass insulation is pretty...
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    Correct

    If the cantilever is not conditioned from inside the room then yes it is possible to have those temps. Remember the wall above the chase interior one is insulated from allowing heat to transfer into...
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    Agreed! Point is unless the heating plant...

    Agreed!

    Point is unless the heating plant is commisioned properly ratings are pretty much worthless in input, output, and efficiency. Even using a gas bill if on NG is pretty hard to calculate...
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    Why the cacls over 8 hours?

    UDarrell,

    Wondering why you based your calcs on only an 8 hour period if you are trying to figure operating costs?

    To other Poster the input is based on the size of the furnace, or boiler...
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    Yup thats it operating cost for the plant....

    Yup thats it operating cost for the plant. Probably not very accurate since I doubt its exactly 13 min per hour, and there is no accounting for the other 16 hours of cycle run time.........Switch to...
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    You should be using the furnace, or boilers...

    You should be using the furnace, or boilers output IF you are calculating the structures btu usage in other words how much heat the structure needs to maintain set point.


    You would use the...
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    Added note

    Should note that this can not be used to back calculate heat loss for a structure at design temps to determine furnace or boiler sizing. Nothing can replace a room by room heat loss calc. But with...
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    HDD method more acurate

    I find the Heating Degree Day per square foot method more acurate. Which pretty much entails what you are doing to a point.

    Some new thermostats have energy usage monitors which time calls for...
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    Calling cantilever chase a Bump out ?

    If so its is the key variable. You can insulate a cantilever to high heaven, and it will always be cold especially when the surface above is cold also. You have three sides of the chase exposed to...
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    Attic location HVAC Cooling

    Looking for opinions. I'm wanting to install AC in my radiant heated home. I have been looking at Unico, Spacepak, and considering conventional low velocity system.


    I have excellent attic...
  15. Thread: HV AC

    by gordy
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    985

    Sorry to bust open this topic again. I have a few...

    Sorry to bust open this topic again. I have a few questions about the space pak or unico systems.

    1. I notice with both brands there is a single return duct. Is it possible to go with 2 returns to...
  16. Thread: Ductwork

    by gordy
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    Thanks !

    Thanks for answering my question people. I was just curious now I know. God for bid the ductwork catches on fire. I agree if one gets out with out choking from the foams, carpets,plastics ect. in a...
  17. Thread: Ductwork

    by gordy
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    Attic AC

    Well, I want to install AC in my attic for a 2300 square foot ranch. Looked into Hi Velocity turned off by the reduction in seer rating. So thinking conventional. Not an avid fan of flexible...
  18. Thread: Ductwork

    by gordy
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    Flexible

    That makes sense to me. So how does flexible duct get around this? Is it the insulation?

    Gordy
  19. Thread: Ductwork

    by gordy
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    Is there any reason as to why there is not a use...

    Is there any reason as to why there is not a use of PVC for ductwork applications for HVAC?

    Gordy
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