The thing about tracking hardware is that it is so expensive that for the say, 15% or so reduction you get due to sun angle you can buy enough extra panels to offset the loss, assuming you have the space. CA new title 24 states that on a new building you must provide an unobstructed roof area of 250 sq ft(no vents, chimneys, or roof penetrations). Those panels must be at least 3'below the peak to provide access for the fire dept. It pains me to say it but solar thermal is about dead in the current American market. I was in the solar and alternative energy business in CA back in the late 70's-early 80's and did hundreds of hot water and other types of solar systems. They work great, but a dhw system today is around $10,000. That money is much better spent on a PV system today. Much better return on that investment. Ground mount systems are fairly common up here in the foothills. My house is shaded by a Sequoia and a few 4' dia Black Walnuts. My only PV option will be ground mount out in the side yard or a new garage roof, I suppose, but then again I spent the garage on the house re-model;). I've seen several up here where they put the array up on a 15' or so tall post. There are, finally, initiatives underway now to establish better specification guidelines for DC power. Snidely, I think you and I would get along great in person, but boy, we sure don't agree on much here. That is in no way a critical statement, quiet the opposite in fact. I'm a fitter/welder in an early life and worked on gas lines from 1/4"-36". I am very comfortable with it, but I understand the process of pipe design and installation. I do think that as we have codes that require smoke detectors that every home should also have CO detectors and, if supplied with gas, have a combustible gas detector. I am surprised that the insurance industry hasn't pulled that off yet. I guess not enough houses/people have been lost that way. Anyway, looking forward to meeting you on the next post;)

Thank you, to all, for your advice. The home is 3827 sq.ft. 2 levels, and we thought we needed to match the 4 ton furnaces. One company priced a 3 1/2 ton which I questioned, but he said if you need more they would upgrade it at no extra cost to us, so I guess they would do a load calc when we accept their bid or if we find it's not cooling enough. Should we be request a load calculation from someone now? I don't remember anyone mentioning doing a load calculation during the bid process. I also find it's very chilly on the first floor, even when the thermostat is set at 70 - 72. I don't think this house is insulated very well and I guess all the heat rises as well. Advice on next steps to take? Thank you for your help with this information. My husband is leaning towards AC, but I wondered if we were making a mistake not trying to go more energy efficient with a heat pump. It's all too new to me, but I'm learning.

Hey guys finally got the HVAC plans to our builders AC guy. They ran a j-calc and did cost comparisons for the units we specified. The calc shows that we need 3.88 tons including ventilation air. first, we looked at conventional units. Between 14 and 16 seer, there is a $2200 difference in equipment cost. 14 SEER = $10893 & 16 SEER = $13,100 b/c they buy so many 15 seer trane systems, they get the 15 seer system at the same price as a 14seer. For our home, there is only a $90/year difference in operating cost between 15seer and 16seer. so the payback would be 6.7 years to go from 15 to 16 seer. we would pick the 15 seer unit in this comparisson. Air source heat pump in the same range isn't even worth looking at. it only saves an additional $10/month. Again, not a big jump from 15 seer conventional gas. however, the dealer did mention that we would probably have to install a fresh air system if we go with gas heat -- this is due to foam spray in our attic and the corners of our house. we may need to rethingk a few things if we go with gas. this is where it gets interesting. we looked at geothermal. 1. the dealer sells all types of systems and manufactureres -- geothermal, air source heat pump, conventional ac... carrier, trane, frigidaire, water furnace... etc etc. 2. he assured me that he has hundreds of units in each system type installed in the local area. 3. there are two other geothermal companies in town, so should he and their whole company get hit by a bus tomorrow, there is still knowledgable geothermal service in the area. 4. I was initially interested in a closed loop system, but we do have a potable water well on site. a/c guy swears that in over 20 years he has not had a problem with open loop geothermal units on a potable water well in our area. local water quality is very high compared to other states where they have installed them. also says that the temperature in a closed loop varies b/c ground temp changes. says open loop is his preference due to consistent water temp from ground well. 5. top of the line Envision system from Water Furnace is $21,495 but the tax rebate is $6,449. 6. geothermal costs half as much to operate. operating cost for the three units is as follows... 15 seer unit = $142/month = $1708 per year 16 seer unit = $134/month = $1610 per year Geothermal = $ 61/month = $ 732 per year 7. we then put the units into a 6.5% interest loan scenario VS the monthly savings to calculate the investment payoff. Pay off for geothermal VS 15 seer is 4.1 years. Pay off for geothermal VS 16 seer is 3.8 years. 8. an installation tech showed us the geothermal loop piping. they use an iron to fusion weld the piping to the fittings. makes for a solid and thick joint. 9. hot water biproduct from geothermal can be used for hot water in our home. all comments are welcome. please shoot holes in all of this. thanks again!!!

Carrier/Bryant, and Trane/American Standard are viewed as the best brands. Even within those brands, there is low end equipment that are not recommended. If you have access to natural gas then you don't need heat pumps. All new construction must have a load calculation. Rules of thumb for sizing should never be used. You can attach the plan, but it is the responsibility of the HVAC contractor to do the load calculation. Be aware that builders/general contractors know very little when it comes to HVAC. They are going to want to spend the least amount of money since most buyers are not knowledgeable enough to question them. They also have a tendency to hire the cheapest HVAC contractor. Ask a lot of questions and demand proof about sizing and equipment.