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If you really understand split system ac and efficiency

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If you really understand split system ac and efficiency

Old 05-25-2019, 06:04 AM
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Default If you really understand split system ac and efficiency

All we use in Bermuda (homes) are mini split systems. Single, dual or tri zone. They work great for heat and cold. Run lines and no ducts, etc.

Here is the question/scenario that no one has been able to answer yet.
At night, chances are all three bedrooms are running the ac. Putting purchase cost aside, Is it more energy efficient to have 1 tri zone doing all three or three individuals? Does the answer change if only one or two rooms out of three are being cooled?
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Old 05-25-2019, 07:33 AM
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By the numbers, SEER, HSPF, COP, EER, typically the smaller single head units are rated to be more efficient then the multi head units. The bigger multi heads are rarely energy star rated above 24 MBTU total. Regarding your question, it's a reasonable deduction that when a multi head unit is operating at a lower capacity that the efficiency is better then at full load or every indoor unit operating.
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Old 05-25-2019, 07:38 AM
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Sort of on topic--if I have a 2400 sq ft house and am getting estimates to TOTALLY replace 2 units--heat & cool, plenum, duct work , etc.
Should I consider some number of the split systems as an efficient, cost effective alternative to replacing the 2 central air systems?
Or are the central heat/cool systems overall better for a whole house
In SE Texas
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Old 05-25-2019, 08:19 AM
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I think the mini-split units will always be more efficient. The key reason is that there is no duct. I know I caught hell for posting this on THT before, but if I had to do it all over again, I'd tear out all the ducting in my house and do mini-splits. I don't have that big of a house... I could have probably gotten it done with 2 2-unit mini-splits. Living/Kitchen area (which is all open). Master Bedroom area. Kid1 BR, Kid2BR. Down the road, when kids move out, etc... it would save a fortune.

...and I don't think they look ugly on the wall... so that's a non-issue to me.
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Old 05-25-2019, 08:26 AM
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Originally Posted by ktdtx View Post
Sort of on topic--if I have a 2400 sq ft house and am getting estimates to TOTALLY replace 2 units--heat & cool, plenum, duct work , etc.
Should I consider some number of the split systems as an efficient, cost effective alternative to replacing the 2 central air systems?
Or are the central heat/cool systems overall better for a whole house
In SE Texas
Its like the question, are twins better than a single outboard. My last house had two separate units. It cost a little more to maintain and run but sure was nice to have when one unit went out. I thought it cooled better once you found the sweet spots on the thermostats.
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Old 05-25-2019, 11:01 AM
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Originally Posted by ktdtx View Post
Sort of on topic--if I have a 2400 sq ft house and am getting estimates to TOTALLY replace 2 units--heat & cool, plenum, duct work , etc.
Should I consider some number of the split systems as an efficient, cost effective alternative to replacing the 2 central air systems?
Or are the central heat/cool systems overall better for a whole house
In SE Texas
Cant help you with the Texas part but I build townhomes and one unit goes in the basement for finished basement/1st floor. Second unit goes in a hallway closet for 2nd &3rd floor. Most are 2-3000ft2. Cuts down on duct work and is way more efficient than a single large unit.

Depending on the layout of your house but I would never choose a single unit over two separate units regardless if it’s a ranch or two story colonial. Only instance I would go with a single unit of it was a 2400ft2 studio apartment with one large open space.

Remember returns in every room if possible to circulate the air.
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Old 05-25-2019, 12:43 PM
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Originally Posted by Budget View Post
All we use in Bermuda (homes) are mini split systems. Single, dual or tri zone. They work great for heat and cold. Run lines and no ducts, etc.

Here is the question/scenario that no one has been able to answer yet.
At night, chances are all three bedrooms are running the ac. Putting purchase cost aside, Is it more energy efficient to have 1 tri zone doing all three or three individuals? Does the answer change if only one or two rooms out of three are being cooled?
3 head mini wth a vrf box.
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Old 05-25-2019, 12:46 PM
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Originally Posted by OldPete View Post
I think the mini-split units will always be more efficient. The key reason is that there is no duct. I know I caught hell for posting this on THT before, but if I had to do it all over again, I'd tear out all the ducting in my house and do mini-splits. I don't have that big of a house... I could have probably gotten it done with 2 2-unit mini-splits. Living/Kitchen area (which is all open). Master Bedroom area. Kid1 BR, Kid2BR. Down the road, when kids move out, etc... it would save a fortune.

...and I don't think they look ugly on the wall... so that's a non-issue to me.
I personally like the mini splits with picture frame distribution - but they are expensive.

My only issue with mini splits is that very few actually service them. If something goes wrong and you view it as a throw away replacement item then I actually agree with you.
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Old 05-25-2019, 01:00 PM
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I'm happy with mine. 2 outside units. 2 on one. 4 other.


I have a 3 story circa 1900 Victorian with steam radiator s. Work s well better than window units. Only put 1 In 3rd floor bedroom for occasion use. Quiet and use like central for most part. Heat function as supplemental is great bonus
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