r/DIYHeatPumps

I’ve had my Costway 18k mini split a couple of months now. A few weeks ago we had temps up and over 105° here and the mini split did just what it should. Now the last 2 days above 90° it just can’t seem to keep up. This morning I did the hand in front of the vent test and air felt as cold as it’s been but once the unit starts falling behind the same test has a slightly warmer air. Still very cool but not really cold. Checked the evaporators and don’t see any ice. Checked the app and inside temperature is showing warmer than set temperature by 2 to 3 degrees. As an experiment I’ve turned the set point down another 3 degrees to see if that changes anything.
What else can I check?

I‘m trying to cool one room in my house without spending a ton, so lately i’ve been thinking about installing a mini split myself instead of paying for full installation. I‘m reasonably handy and have done normal DIY stuff around the house before, but never anything HVAC related. Looking at a smaller costway system for the room. Mostly wondering how difficult this actually is for a first timer and what parts people usually mess up. Anything specific i should pay attention to before deciding whether to attempt it myself?

Everybody seems to have their own favorite brand and some posts on here just look like downright shills. I don't have any brand loyalty, I'm tempted to just grab some random whitelabel mini split off Amazon and be done with it but I'd rather shell out some additional cash to get something that's not going to bite the dust after 6 months. What are some brands who will actually sell a precharged kit directly to an end user?

My requirements are pretty straightforward. I want something that's:

• precharged with refrigerant
• flare your own line set
• 12,000 BTUs
• Decent heat output down to 5f

I've got my own vacuum pump and tools, I'd gladly buy a Mitsubishi if they would sell it to me. It's frustrating that all the higher end recommended brands are 100% locked down to their existing contractors and distributors and DIY gets left to 100 different whitelabel brands. I don't even have an issue with buying a whitelabel unit but I'd rather not pay an extra $1000 markup because they slapped a new logo onto the side.

What's everyone's favorite brands that you can actually buy without going through a traditional HVAC company?

I’m doing my research to install a 3 zone (9k, 9k, 18k) multi zone gen 5 MRCOOL system. The two 9k will be in my kids bedrooms on second floor and the 18k in the living room below one of the bedrooms. I have a friend who owns an HVAC company I did a bathroom for (I’m a tile contractor) and it was supposed to be a free labor for free labor trade but he said I’d have to pay him labor on top of the 15k cost for a 4 zone Mitsubishi setup. So here I am

Just curious if anyone else has taken on a project like this here. Any tips appreciated. Also wanted to know the life expectancy for one of these multi zone units of regular cleaning is adhered to in New England area?

Worth noting we also have baseboard heat so these units would be supplementary in the winter

Hey all, looking for some advice.

I’ve had two very different quotes for an ASHP install:

• Local installer: £9,800
Includes a 10kW Ideal heat pump, all radiators replaced, 2 additional radiators installed, and new pipework throughout. This quote was done after a full survey.

• EON Next: £6,600
Includes a 12kW Vaillant system, 210L tank, and around 60% radiator upgrades. This one is still pending survey.

For context, my house is currently EPC E. I’m also getting solar panels and a battery installed in the next couple of weeks. The heat pump is partly to improve the EPC and hopefully add some value to the property long term.

My questions are:

1. Does the EON quote sound too good to be true compared to the local installer?
2. How much usually changes after the EON survey?
3. Do heat pumps actually add value to a property in the UK, or is it more about future proofing and lower running costs?
4. Would you personally trust a large national installer over a smaller local company for this kind of install?
5. How was your experience with EON ?

Would appreciate any thoughts or experiences, especially from anyone who has gone through the process recently.

Hello community I want help from all of you regarding a cooling system I am thinking to add to a rather strange pc-laptop hybrid which I want to make in future. It is going to be a chamber structure is like a building having door as exhaust. Full build is like this

For cpu only:

Open place for air

160x160x25 mm fan 1500rpm cw 0.5mm gap 140x140x25 mm fan 1800rpm ccw 0.5mm gap 120x120x15 mm fan 2100rpm cw 5mm gap 60x60x30 mm cu heatsink Cpu- ryzen 5 5600xt --------------------> exhaust to rear

For gpu only: rtx 3060 282mm lentgh there is two cloumn to cover whole gpu lentgh

Open air

140x140x25mm fan same as above
0.5mm gap 140x140x25mm fan same as above 0.5mm gap 120x120x15mm fan same as above 5mm gap Original gpu heatsink ----------> exhaust rear

Both exhaust connect at same place in Y shape at the joining place there is one of those gpu blower fan

Hello, I'm looking to replace our current 3 ton system. I live in an area where electricity is ridiculously expensive, close to $.50 per kWH, so I would want have a furnace. My current furnace is in good shape so I think I want to keep that.

My plan is to replace the R22 evaporator and condenser, with:
- 3 Ton MrCool VersaPro Central Heat Pump Condenser
- 2.5 to 3 Ton MrCool Evaporator Coil 
Along with the no-vac lineset. I do have my 608 certification so I am not shy to have to handle refrigerant and brazing lines or what not, but for just replacing one unit, I don't want to buy the brazing tools, gauges, manifolds and such just to use once or twice.

The reason why I am looking into the above combo is that I can use the no-vac line set. If there's a cooling only condenser that uses no-vac and works with the A-Coil's controller and is 454b, I'd jump on that.

Any other suggestions? And is there a way I can lock out the heat portion of the heat pump completely and only use the furnace?

I have a Tosot 2 Zone Mini split I installed in the fall. All through the winter the heating worked great in both zones. Now that it's getting hotter the cooling is not working out.

Zone 1 gets super cold very quickly, and then zone 2 doesn't get cold at all. Even when zone 1 is off and zone 2 is blasting, the head in zone 1 freezes over instead of the coolant going to the other zone.

What are some things I can do to troubleshoot this issue? The filters are clear, the drain hoses are unobstructed, and the connections are tight. I'm planning on re-flaring the ends and reassembling it, but I'm not sure if that's the right way to go about it.

Here's an image of the zone 1 head after the zone 2 has been blasting at high for an hour while zone 1 is off.

EDIT: Solved! The communications wires were swapped. After fixing the issue it's cooling no problem!

https://preview.redd.it/6v5yq7q0hk0h1.jpg?width=4080&format=pjpg&auto=webp&s=9b91398dc6f4df14f91baea0f6823afb8f957181

I'm trying to find what the newer 3 ton universal unit can handle for its minimum CFM. I was looking to split my home into 2 zones 1 per floor, but the second floor is substantially smaller. All advice is welcome!

I’m putting Mr cool in a new build cabin. I need to get it running in this phase of construction so we can start having heat. I am at the point where I can mount the inside head unit and run the lineset through a wall. Is there any harm in connecting the lineset to the head unit and few weeks before the install is complete? Or do I have to wait and connect it all at the same time?

Im looking to install a 18000btu unit at my house. Ideally, I would get the 50' line set, but the unit is only precharged to 25'. The manufacturer recommends adding 8oz to top up the unit. Unfortunately, the hvac installers around here dont seem to want to touch a diy job. Is 8oz difference going to be critical? Do I have other options for adding refrigerants? Thanks

Hello everyone! So I’m currently building a little shed but I’m not sure on what to put in there(a mini split or regular window unit). It’s a 184 square feet room (16x11.5) and I have a panel there for 4 breakers. 1 to connect all the lights, 1 for majority of the outlets, 1 for the GFCI outlet for a restroom, and lastly 1 dedicated for the air conditioning. I want a heater with it too. So the problem is I need a mini split that is 115v and uses less then 20amps because all 4 breakers are 20amp breakers each. I tried looking online but I don’t know much about mini splits so hopefully yall can help me. Here’s the info I have again
184 square feet (16 x 11.5)
110v-115v
Less then 20amps