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| We are looking to Purchase a home in the Houston area. It is ~3200 sqft. The house has three central A/C units. Is this normal? Is it gonna cost more electricity to have these running in our hit summers? Or will they work together towards efficiency. Our current 2 story home has 2 units and 3000sqft |
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| No, it will cost less than if you have one if you use them wisely. Get good thermostats or a control system and program with some planning. Something that you can control remotely might be nice depending on your lifestyle. Cool or heat the areas you are using at a particular time and close the doors leading to the other areas so you are not conditioning the whole house. I have a 2000 sq foot house with 7 rooms. There are 3 systems with a total of 7 zones between them. |
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- Posted by energy_rater_la (My Page) on Thu, Apr 12, 12 at 12:32
| it depends. what size are the units what age are they what is layout of the house I would be concerned with dehumidification some companies 'zone' with multiple units. other companies zone with one unit and I see existing homes with 3 units sometimes have a few companies look at your existing hvac systems several good people on this forum will help do you have any model numbers? ionized..I just don't know what to say... best of luck OP. |
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| Ductless mini-splits: Indoor: 3 x 9000 BTU and 4 x 6000 BTU Outdoor: 1 x 22,000 BTU and 2 x 18,000 BTU ;-) |
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| Its a two story home. living, dining, kitchen, master bedroom and a guest bedroom down. Upstairs are two bedrooms and a bathroom with a central gameroom/loft. there are two attics that are entered via normal doors. (I guess you'd call it a texas-basement...) One of them is enormous inside. Looks like you could ad another room or two in there. It has a functional window too - but it's up high. Almost looks like if you built up a subfloor and small stariway you could conceal the hvac systems and ducts and still have some new rooms. So, I dunno if the A/C plan is designed to allow for this potential expansion. I only remember seeing two return ducts. Maybe the third is in the master. or hall near master. I'd have to take another look. |
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- Posted by david_cary (My Page) on Sat, Apr 14, 12 at 7:44
| 3 units isn't necessarily a problem. Maybe somebody had a deal on 2 ton units or too many of them and the load calc suggested 5 tons of cooling. So they put in 3 - if they are sized ok, then you are fine. Mind you, if you can figure a way to just have 1 run most of the time, you will get better dehumidification and lower running costs. Now you do run into higher maintenance costs and replacement costs over time... |
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