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Message
Adding a Mini split* to Master Bedroom
Posted on 6/14/21 at 11:19 pm
Posted on 6/14/21 at 11:19 pm
I am bouncing around the idea of adding a split unit to my master bedroom so instead of cooling the whole house at night, I just maiming cool out room. Anyone have any experience?
This post was edited on 6/15/21 at 6:11 am
7
Posted on 6/14/21 at 11:28 pm to b-rab2
If you mean a mini-split and you have an exterior wall it's not a terrible idea.
HUGE con is that, in this southern climate, you need to run A/C indoors at all times to properly dehumidify the conditioned space.
Saving $75 or so a month and having mold grow on your sheetrock in the partially conditioned spaces is not a good tradeoff.
You offered very few specifics so my answer is based on little actual information.
ETA: Maybe keep your master bedroom mini-split at 72 or whatever you like and then up the rest of the house to 80 or so.
HUGE con is that, in this southern climate, you need to run A/C indoors at all times to properly dehumidify the conditioned space.
Saving $75 or so a month and having mold grow on your sheetrock in the partially conditioned spaces is not a good tradeoff.
You offered very few specifics so my answer is based on little actual information.
ETA: Maybe keep your master bedroom mini-split at 72 or whatever you like and then up the rest of the house to 80 or so.
This post was edited on 6/14/21 at 11:29 pm
Posted on 6/14/21 at 11:37 pm to AndyCBR
IMO I would only do this if I loved it absolutely freezing in my bedroom while I sleep - like 65 degrees while keeping the rest of the house relatively cool like 72-75, but that’s just me
Posted on 6/15/21 at 5:56 am to AndyCBR
a few more specifics:
Yes, a mini split with an exterior wall
I live in a fairly large house ~3,800 sq ft with two separate A/C units and thermostats splitting the house. At night, we lower the temp to 71-72 on one side of the house and leave the other at 74. So if I added the mini split I wouldn’t lower the side to 71-72 and would leave it at 74, but lower my bedroom to 69-70 where we like it fairly cold to sleep.
Yes, a mini split with an exterior wall
I live in a fairly large house ~3,800 sq ft with two separate A/C units and thermostats splitting the house. At night, we lower the temp to 71-72 on one side of the house and leave the other at 74. So if I added the mini split I wouldn’t lower the side to 71-72 and would leave it at 74, but lower my bedroom to 69-70 where we like it fairly cold to sleep.
Posted on 6/15/21 at 6:34 am to b-rab2
I have one in an man cave exterior to the main home. Fan runs all the time even when it’s not cooling. It’s just a hole in the wall so bugs occasionally get in. I run a dehumidifier in there and it stays very dry.
Posted on 6/15/21 at 6:36 am to b-rab2
In your situation yes that’s likely a good idea. I’m not going to tell you that you will absolutely save money, you may be better financially just lowering your thermostat and moving on with life.
How close is your breaker box to your master because I believe they need 240V.
How close is your breaker box to your master because I believe they need 240V.
Posted on 6/15/21 at 7:12 am to AndyCBR
quote:
HUGE con is that, in this southern climate, you need to run A/C indoors at all times to properly dehumidify the conditioned space
I must not be understanding. What do you mean at all times?
Posted on 6/15/21 at 7:12 am to b-rab2
I've thought of this, mainly because of the layout of the house.
But, let me add this that may help the OPs situation.
Does your master bedroom tend to stay hotter than the rest of the house? If so, check your return air flow condition. If you have limited return, the AC blower has a harder time trying to bring cooler air into the room.
I had to add a return air duct in the wall which helped.
But, let me add this that may help the OPs situation.
Does your master bedroom tend to stay hotter than the rest of the house? If so, check your return air flow condition. If you have limited return, the AC blower has a harder time trying to bring cooler air into the room.
I had to add a return air duct in the wall which helped.
Posted on 6/15/21 at 7:17 am to b-rab2
What type of thermostat do you have? I have an ecobee with remote sensors, so you can set it for different modes where it only uses the sensors for specific rooms. For example, “Sleep” only uses the bedroom sensors for that unit.
Specifically on the mini-split, they work great but seem like a lot of overkill for what you’re doing. You will need an exterior wall to ensure no potential concern with condensate. You’ll also have a condenser just outside that wall. The good ones are 220V, but they are 110V if only getting a smaller unit.
Specifically on the mini-split, they work great but seem like a lot of overkill for what you’re doing. You will need an exterior wall to ensure no potential concern with condensate. You’ll also have a condenser just outside that wall. The good ones are 220V, but they are 110V if only getting a smaller unit.
Posted on 6/15/21 at 7:58 am to East Coast Band
quote:
oes your master bedroom tend to stay hotter than the rest of the house?
It does stay hotter due to it sitting directly in the western setting sun along with 3 large windows(we have blinds and thick curtains). We get good air in there, but its always 2-3 degrees warmer because the thermostat is not in the bedroom but in the hallway where it needs to be. It is in the back corner of the house, so having an exterior wall is not a problem.
Posted on 6/15/21 at 8:01 am to LSUtigerME
quote:
What type of thermostat do you have?
typical programmable thermostat.
quote:
but they are 110V if only getting a smaller unit
smaller unit might be all I need.
Posted on 6/15/21 at 8:31 am to b-rab2
From a cost savings point of view, it would take a long time to pay for itself. I'm assuming costs would be around $4-5k for unit and installation. Make sure the installer has a lot of experience with them. It has to be perfectly level or it will not drain properly (and will leak in your bedroom). With AC units always go, "one size up." We have a Mitsubishi and it works well.
It may not look great, but if the BR is on the back of the house and window location allows it, I'd think about a window shaker.
It may not look great, but if the BR is on the back of the house and window location allows it, I'd think about a window shaker.
Posted on 6/15/21 at 8:31 am to LSUtigerME
quote:
I have an ecobee with remote sensors, so you can set it for different modes where it only uses the sensors for specific rooms.
Do the same thing with our nest(I hear the ecobee is more HVAC friendly though). We have a remote sensor for our master which we set to be the target temp during the evening/bedtime. Works well enough.
Posted on 6/15/21 at 10:11 am to greenbean
quote:
From a cost savings point of view, it would take a long time to pay for itself. I'm assuming costs would be around $4-5k for unit and installation.
This seems high for what he needs IMO. I had a 2T Mitsubishi unit installed for like $3k, with the wiring already installed. If he’s just getting a 1T 120V unit, it should be a lot cheaper.
Although, I do agree it would still take a while to pay for itself.
Posted on 6/15/21 at 11:54 am to b-rab2
we did a remodel last year and had 2 rooms that weren't tied into the central AC. One was a guest room office, one was our master bed room.
We put one in both rooms and i enjoy it more than central AC because you can let the rest of the house be at 81 at night and crank one room to about 74.
We put one in both rooms and i enjoy it more than central AC because you can let the rest of the house be at 81 at night and crank one room to about 74.
Posted on 6/15/21 at 12:52 pm to LSUtigerME
With the energy costs here in Minden, LA. It would probably pay out pretty quick. 
Posted on 6/15/21 at 3:20 pm to LSUtigerME
quote:
This seems high for what he needs IMO. I had a 2T Mitsubishi unit installed for like $3k, with the wiring already installed. If he’s just getting a 1T 120V unit, it should be a lot cheaper.
That's about what I paid five years ago, but I don't know how much they have gone up. I always overestimate.
Posted on 6/15/21 at 9:12 pm to b-rab2
I came across this video the other day and thought it was cool that you could diy. It could be a good option? Mini split
Posted on 6/17/21 at 6:48 am to lighter345
quote:
must not be understanding. What do you mean at all times?
I think he’s saying you need your central air to run some to keep the humidity down in the rest of the house. In the event you were just planning on turning off your home AC rather than just leaving it alone and keeping your bedroom ice cold. Don’t think that was your plan.
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