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Type: Posts; User: jza29970

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    Heat Pump Versus Hybrid

    I am upgrading my HVAC because the old AC is dead. I am thinking of installing a gas forced air furnace /AC but also thinking of a heat pump or perhaps a hybrid system that uses a heat pump and a...
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    Noisy information can be useful. I've taken...

    Noisy information can be useful. I've taken courses in statistics so I think I understand the problems with surveys. There can be a lot of sampling noise (like with opinion polls) and there can be...
  3. I am facing the same problem here in Northern...

    I am facing the same problem here in Northern Virginia. I just found this neat online calculator:
    http://www.hvacopcost.com/

    However, I don't know how it does the calculations. :( And I don't...
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    That is a great calculator, and it implies I...

    That is a great calculator, and it implies I would save about $1,000 per year. However, I would like to be able to do the calculations myself, because I tend not to trust other people's...
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    Well, those surveys may be flawed but they do...

    Well, those surveys may be flawed but they do provide information. It will help to identify "stay away from brands". I am getting conflictng advice from different pros with good reputations. It...
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    Thanks! What kind of pro would I look for to do...

    Thanks! What kind of pro would I look for to do such a leak test?
  7. Actually, there are no baseboards. The boiler...

    Actually, there are no baseboards. The boiler goes to a heat exchanger which pumps forced air through ducts.
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    How do I calculate heat pump savings?

    I need to replace my AC and am thinking about going with a heat pump system. How do I go about calculating the savings from a heat pump?

    Currently, I use about 1500 therms per year to heat the...
  9. How big is my boiler and how efficient is it?

    I currently have a 1991 Peerless MCB-130 boiler system. The faceplate says that it has a Max Input Capacity of 130,000 BTU/hr, and a DOE HTG Capacity of 107,000 BTU per houw and a Net I.B.R. Rating...
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    Replacing boiler with hot air furnace??

    I need to upgrade the HVAC system in my house because the old AC is dead. The current system uses a Peerless gas boiler (manufactured in 1991). The hot water is then piped into the room next door...
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    Replacing boiler with hot air furnace??

    I need to upgrade the HVAC system in my house because the old AC is dead. The current system uses a Peerless gas boiler (manufactured in 1991). The hot water is then piped into the room next door...
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    Reliability data on different brands

    I need to upgrade the HVAC system in the house, as the AC is dead. Where can I find reliable and objective data on the reliability and customer satisfaction with different brands? I see plenty of...
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    Rejuvenating old radiant heat system?

    My house was built in 1957. According to the former owner, the house once had radiant heat, but it had been disconnected by the earlier owner prior to 1991. (There are some open pipes sticking out...
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