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Old 03-04-2012, 09:28 AM   #16
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Installing A/C in old house - Conventional vs. High Velocity


Nothing is easy in those homes but at the end of the day a choice has to be made. A skilled contractor who specializes and does renos in those homes is the best way to go. We have one here who does 1/2 to million $$ renos and the experience and proper subcontractors to properly do the finishing which is usually the biggest problem when you start cutting into those old lathe and plaster and architectural ceilings etc. VERY expensive proposition to say the least.

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Old 03-04-2012, 10:01 AM   #17
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Installing A/C in old house - Conventional vs. High Velocity


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You do not add up breakers to do a load calculation.
Obviously. I am just throwing out some breaker sizes here and you can guess at the operating current for a very general approximation. There is a lot more to be taken into consideration here. I am just not used to seeing 100 amp service with central A/C, elect dryer, elect range plus the general stuff. At least he doesnít have an electric hot water heater. Too bad he doesnít have gas cooking or dryer. That could make this a go assuming everything is average. Again, no substitute for a true load calc.
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Old 03-04-2012, 10:09 AM   #18
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Installing A/C in old house - Conventional vs. High Velocity


OP, code five was working with what we can tell from the info provided.

It is an honest assessment of your electrical supply which everyone agrees need to be up-graded.

Your reluctance to accept the suggestion does not alter the need to change the electrical service.

You have a full box and even though an electrical load has not been done I think you will find the local authority not too willing to accept two sub panels.
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Old 03-04-2012, 10:11 AM   #19
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Installing A/C in old house - Conventional vs. High Velocity


OP, code five was working with what we can tell from the info provided.

It is an honest assessment of your electrical supply which everyone agrees need to be up-graded.

Your reluctance to accept the suggestion does not alter the need to change the electrical service.

You have a full box and even though an electrical load has not been done I think you will find the local authority not too willing to accept two sub panels
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Old 03-04-2012, 10:19 AM   #20
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Installing A/C in old house - Conventional vs. High Velocity


Probably still has that creepy old cotton covered wire too. I am amazed more of those homes don't burn down. You don't want to be moving it or disturbing it to add subpanels so I would get some info from a reputable electrician on what is the safest way to go about it. Fuses are verbotten where I am and the ins companies won't insure some homes with them or charge twice as much.
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Old 03-04-2012, 10:54 AM   #21
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Thanks everyone. I understand that there is concensus for upgrading to 200 amp service.
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Old 03-04-2012, 11:08 AM   #22
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Installing A/C in old house - Conventional vs. High Velocity


High velocity systems, when installed correctly can be nearly invisible. Keeping the detail of the home, that is probably the way to go.
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Old 03-04-2012, 11:14 AM   #23
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Installing A/C in old house - Conventional vs. High Velocity


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Thanks everyone. I understand that there is concensus for upgrading to 200 amp service.
With these character homes you DON'T want to be shopping for the cheapest contractor. The better ones won't hack holes or do cosmetic damage etc so you get what you pay for. Also these modern minisplits and other units are very grounding and neutral sensitive so an electrical upgrade helps with grounding etc and is safer overall.
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Old 03-04-2012, 11:17 AM   #24
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High velocity systems, when installed correctly can be nearly invisible. Keeping the detail of the home, that is probably the way to go.
The best and ONLY way to know 4 sure what you are getting is to see and hear one installed in your neighbors house AND get their contractor. Otherwise it is a lottery as to what you get and you don't want to gamble with a character home.
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Old 03-04-2012, 04:29 PM   #25
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Installing A/C in old house - Conventional vs. High Velocity


From my perspective it really comes down to the cost of maintenance of two systems vs. the convenience of two zones. That said, in general you're probably going to keep your thermostat at a consistent temperature and a well designed and balanced system will give you even cooling throughout, so you might want to consider carefully whether two zones have any real practical benefit for you.

I would probably go with high velocity in an older, historic building for the simple fact that your ducting will be less obtrusive. That is very popular around here in older town homes for exactly that reason.

The one downside about high velocity from people who have it is the noise of the air coming out of the vents. It bothers some people...other people not at all.
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Old 03-04-2012, 06:59 PM   #26
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Installing A/C in old house - Conventional vs. High Velocity


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Originally Posted by mpnret View Post
Obviously. I am just throwing out some breaker sizes here and you can guess at the operating current for a very general approximation. There is a lot more to be taken into consideration here. I am just not used to seeing 100 amp service with central A/C, elect dryer, elect range plus the general stuff. At least he doesnít have an electric hot water heater. Too bad he doesnít have gas cooking or dryer. That could make this a go assuming everything is average. Again, no substitute for a true load calc.
100 amp service is all I have.

Central A/C
Electric range
Electric dryer
Electric water heater
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Old 03-05-2012, 05:50 AM   #27
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Installing A/C in old house - Conventional vs. High Velocity


Go with the mini splits you'll be happy. An old house is nothing but problems besides your house isn't going to be a museum or art gallery it's just an old house. Plus if you have a failure you always have another one for backup until the service company can get to you.
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Old 03-05-2012, 07:33 AM   #28
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Installing A/C in old house - Conventional vs. High Velocity


Mini-Splits are not the answer.

They do nothing but detract from the historic persona the home projects.

You either get or you don't. This is one type of job where what seems like the "best or easy solution"--- mini split ----is not good for the home.
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Old 03-05-2012, 07:45 AM   #29
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Installing A/C in old house - Conventional vs. High Velocity


As I mentioned, we ruled out mini splits. Although I know we don't live in a history museum we still need to be mindful of our resale value of the house and enjoy the charecter it projects. Mini splits are great in a modern decor, but that's not our house.

It seems to me high velocity is a more risky solution since it has to be done 'just right'.
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Old 03-05-2012, 07:55 AM   #30
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Installing A/C in old house - Conventional vs. High Velocity


did u try getting a recommendation for a guy from the historical society?

hi pressure ac's have bee installed successfully and noiselessly for years

u could call the factory to get a name too.

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