System for new house
I am trying to pick a system for a new house I am having built. The contractor is trying to get me to install 2 heat-pump units. One upstairs and one in the basement.
I think I only want one unit installed. It would be propane. I do not like electric heat or heat-pumps. It would have a DC blower motor that I would run 24 hours a day to keep the air circulating (it costs almost nothing to run a DC motor), with an electric filter like the clean affects. I think I could have a return air in the basement and upstairs to pull air from both areas. I would also have a 2 stage unit. I am not sure what seer or efficiency rating to get on the furnace. I am thinking maybe 90 % on the furnace and 13 seer 2 stage AC.
The builder is telling me that the walkout basement even though it is well insulated will have a much different temperature than upstairs. I am thinking if I am always moving air that the temperatures would equalize somewhat. I don't want the cost of installing and maintaining 2 HVAC units.
Please I am open to any advise and suggestions.
Heat rises and cold air falls. It will be difficult to maintain temps on 2 different floors. At the very least. I would go with zoning. As far as going straight propane. It is very expensive to heat a house with. If you're set on propane. I would install a heat pump and use the propane as backup or emergency heat. Trust me on this one. You will get a huge shock on your propane usage. Almost everybody that has installed only propane for heat regrets it when you have to pay for it.
I like DIY'ers. They pay better to fix.
I Built my house 20 years ago. Propane/wood combo. This is the first year that I ran on Propane only and I was shocked. It was three times the cost of burning wood.
Two furnaces is the way to go, I would think about heat pumps too.
I agree with BM.....stay away from propane. I would do a geothermal (one system) with the ductwork designed so you can control each level seperately thru manually dampering or (auto) zoning.
How large is the home to be and where are you located?
if your set on one system and propane dual fuel and and a zone system would be the way to go
I don't think there are many 13 SEER 2 stage AC units out there.
Have you used propane in the past? We have customers pleading for any solution to get them out of propane. The price is unbelievable.
I would build the home to the highest possible insulation standards, (foam), avoid propane at all costs, re-consider air to air heat pumps, and maybe even consider geo-thermal, if it's in your budget. And of coarse make sure the HVAC systems are PROPERLY SIZED!
2 separate systems are the best way to go.
"Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler
at 13 seer i don't believe there are any, but i could be wrong.
Originally Posted by airsys
Like has been said heat raises, and cold air falls. You won't have a good temperature on one floor, no matter what. The only way you can even possibly get away with a single system on a multi-story house is if it is absolutely sized correctly, ductwork done absolutely correctly and it is zoned. 2 units are definitely the way to go.
The problem with running the fan 24/7 is the fact that when the cooling cycle ends it won't allow the coil to completely get rid of the moisture on it, and therefore will put it BACK into the house. If you live in a humid environment you'll be working to get the humidity out of the house in the first place, and if you can't get it all out of the system and it's going backinto the house then you'll be defeating the purpose.
Well built, air tight, and controlled fresh air ventilation are my concerns for comfort and health. Are you concerned about indoor air quality? Fresh is needed to purge indoor pollutants and renew oxygen. Should include fresh air change and maintaining comfortable humidity levels. Usually this includes winter humidification and summer dehumidification.
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"
LOCATION LOCATION LOCATION ...
You need an INDEPENDENT HVAC design.
Originally Posted by Eric2
..... I would be inclined to start with 2 systems in a design effort unless the house is "quite small".
No location or house size or envelope details or life style ...
SO nearly all comments here would not be too meaningful.
Hybrid - dual fuel
if in an appropriate Location.
... STAY AWAY FROM PROPANE.
........ unless you own one of those Money Trees.
It's Not Rocket Science, But It is SCIENCE
with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE
Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities
How about me!
WOW! Is there opinions or what.
Originally Posted by Eric2
The only time I recommend a two system approach would be when your cooling load is greater than 5 tons; otherwise one system is sufficient and more than enough to meet the building loads, and if there is too much differing peak loads, then go with zoning.
With the prices of propane these days and the future, I would definitely offer and go with Heat Pumps systems. Of course, with a propane back up.
Thanks for all the suggestions.
The house is going to be 2500 sq feet counting the walkout basement. ICF construction in Northwest Arkansas.
1250 up and 1250 down?
Originally Posted by Eric2