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Type: Posts; User: mhitim

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  1. Replies
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    Two Units vs. One

    I just ran a room by room Manual J using HVAC-Calc on my home, which is a 23 year old, two story, 3,400 square foot (the first floor is about 1800 sq. ft. and the second floor about 1600 sq. ft.)...
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    343

    Simple Dual System

    I give up! I have spent countless hours researching the latest and greatest HVAC systems and the bottom line is that I cannot find anybody in my area that will go beyond the standard X tons per...
  3. Replace Blower for 20 Year Old York Furnace

    I won't be able to replace my HVAC system until early summer. Unfortunately it sounds like the blower motor or fan bearings are about to go. I would like to implement a short term fix that will...
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    2,635

    54regcab What you and jtrammel are saying...

    54regcab

    What you and jtrammel are saying makes perfect sense to me. One thing is for sure is based on 20+ years of experience I push 85% of my heat into the to downstairs zone in the winter and...
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    54regcab I really like the idea of two systems...

    54regcab

    I really like the idea of two systems for a variety of reasons but I've always assumed that it would be the more expensive solution. Is it likely that a system with "less expensive"...
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    Is this a theoretical issue or have you dealt...

    Is this a theoretical issue or have you dealt with a backdrafting problem? There are many WHFs in my area and I have not heard of a single problem and I can attest that I have not had one. Plus if I...
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    I have thought about it and it is all about...

    I have thought about it and it is all about exchanging hot air for cool air. Assume a volume of about 35,000 cubic feet. On low my WHF will exchange the air in about 3.5 minutes and if I used the...
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    California near Sacramento

    California near Sacramento
  9. Replies
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    2,635

    I agree with HVAC-TALK community about load...

    I agree with HVAC-TALK community about load calculations and getting a good contractor. A lot easier said than done in my area. I'm having a hard time just getting someone to do a Whole House...
  10. Replies
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    Natural gas range, NG furnace in the attic and NG...

    Natural gas range, NG furnace in the attic and NG Eternal Hybrid hot water heater in the garage. Why do you ask?
  11. Replies
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    3,335

    Ducted Whole House Fan

    I currently use a 42" 5 blade whole house fan that is great for our cool summer nights. It is not a device that most HVAC and Insulation experts like. I have heard rumors that there are some ducted...
  12. Replies
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    Lennox Harmony System

    I've been told that the Lennox Harmony Zone System is unique in the marketplace. My understanding is that it is the only system that seemlessly controls a variable speed blower using...
  13. Mitsubishi Ducted AC (not ductless, not heat pump)

    I was told that Mitsubishi makes conventional, ducted AC units (not heat pumps). In addition I was told that it uses an inverter drive compressor (DC, true variable speed). I cannot find these units...
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    Zone System Features and Benefits

    I plan to zone (3-4) my 3500 sq. ft., two story house. This site has advised me to use a 2-stage compressor and variable speed blower, which I plan to do.

    I've been told that there are some...
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    HVAC Ducts Over or Under Insulation

    In conjunction with a new HVAC system I will be installing I'm also developing a retrofit insulation strategy for my two story house. I plan to remove all of the existing attic insulation and then...
  16. Manual J and D Don't Apply to Zoned Systems

    I've been taking your advice and insisting on measurments and calculations from an HVAC contractor before I will even consider him/her. As I've said in my other posts it seems as if no HVAC...
  17. Thread: Zone Control

    by mhitim
    Replies
    2
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    716

    Zone Control

    What is the state of the are in Zone Control these days? I had a contractor tell me that the Lennox Harmony III is still the only unit in the residential market that actually controls the speed of a...
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    3,738

    I buy my electricity from the Sacramento...

    I buy my electricity from the Sacramento Metropolitan Utility District (SMUD) at $0.17/KwH and even though that is expensive it is one third the cost of PG&E in my area. The real question is how do I...
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    First of all to dan_sw_fl. This is absolutely not...

    First of all to dan_sw_fl. This is absolutely not a DIY. What, you think I haven't been paying attention to you guys? :grin2: Plus I have no problem letting my contractor tear into drywall if it is...
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    Excess Load in Three Zone System

    Assume my duct work will not handle the excess supply for the three zone system I plan to have installed in my 3500 sq ft, two story house. Let's also assume that it is too expensive to upgrade the...
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    Do you thinkk a heat pump, especially either the...

    Do you thinkk a heat pump, especially either the Greenspeed or Extreme would be the best choice for the climate near Sacramento, CA? Winter lows in the mid 30s with an occasional dip into the 20s and...
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    3,738

    Inverter/variable speed compressors

    This technology really seems to be the way to go. Do you all agree? The problem is I can't seem to find many companies using it in their residential, full size AC systems.

    I am aware of the...
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    Wahoo, I have two returns both 20" x 20" about...

    Wahoo,

    I have two returns both 20" x 20" about 15' apart, both upstairs in the ceiling over the landing, which is dead center in the house.

    If I understand what your saying I don't need a...
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    SkyHeating, You are right right on for the...

    SkyHeating,

    You are right right on for the cost per therm but my cost per KwH is closer to $0.17. The numbers I shared reflect the "above baseline" usage in the three hottest and four coldest...
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    Advice on Replacing 20 Year Old System

    Great website. I would deserve a Masters degree in HVAC if I read even half of it. That being said there is a lot to digest and it's hard to find the time so I'm hoping that feedback to my situation...
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