Admin on January 30, 2015 60 Comments Ductless air conditioning systems are becoming quite popular these days for a variety of reasons. Also known as mini-splits, these systems provide cooling capabilities without the many problems associated with ducted setups. Using a ductless system, homeowners can better regulate the temperature from room to room, while reducing energy loss typical with inefficient duct work. The following information can serve as a guide for those interested in installing mini-splits in their homes. This includes the main components of such systems, how mini-splits typically operate, and the numerous benefits afforded by taking duct work out of the equation. In addition to home use, these systems also have a wide range of business applications. This is especially pertinent for businesses seeking more environmentally-friendly methods of cooling a structure. How Mini-Split Systems Work Whether used for heating or cooling purposes, all mini-split AC systems are comprised of outdoor and indoor apparatus. The outdoor condensing/compression unit applies pressure to refrigerant, which is then dispersed through lines that are connected to indoor apparatus. This indoor unit consists of three elements, including air-handlers, blowers, and the evaporator coil. Indoor air-handling units are placed strategically throughout a home, which allows for more efficient energy usage. Air-handling units can be placed in a number of areas within the home, including both walls and ceilings. This can be beneficial for a number of situations, as necessary equipment can be placed in out of the way locations. Additionally, by placing the condensing unit outside, homeowners won’t be bothered by operation noise typically associated with air conditioners. Learn More About How Ductless AC Work Mini-Split Systems Options As many homeowners are unfortunately aware of, conventional HVAC / central air systems are lacking options when it comes to configuration. This can make it difficult for homeowners to get the most out of their cooling systems. Conversely, mini-split systems are available in a variety of configurations. The following options can allow homeowners to customize a system to their exact needs. Heat Pump: For additional heating capabilities, mini-splits must be outfitted with a heat pump. This device is responsible for transferring heat from one place to another. Heat pumps also include a reversing valve, which can change the direction of heat flow. Single-Zone/Multi-Zone Condenser Unit: Outdoor condensers must be connected to indoor condenser units. As the names indicate, a single-zone unit can heat a single room or zone within a home, while the multi-zone units can occupy a number of rooms or zones. Ceiling Cassette: In situations where space is limited in the home, a ceiling cassette may be the perfect option. Fan coils are outfitted in the ceiling, and disperse air via the exposed grille. Wall Unit: This device is where temperature adjustments will be made, allowing homeowners the option of cooling a specific room or area within a home. Common Applications of Mini-Splits Mini-splits can be a great match to certain situations within the home. Those adding new rooms, or renovating old, to their homes are the best candidates for such systems. In many cases, a home’s existing cooling/heating systems will not be adequate within newly added rooms. Mini-split systems can help create a comfortable environment in this event. Mini-split systems are also great for those seeking supplemental cooling capabilities. This can be a concern in larger homes with smaller central systems. In cases where expansion of duct work can prove problematic, mini-split systems can prove ideal. This is usually the case with converted basements or garages. Newly constructed homes may also be benefited by ductless systems. This is especially true for those looking to save energy, thereby cutting monthly utility costs. Benefits of Ductless Cooling in One’s Home Below are a few of the many benefits you can expect from installing a mini-split air conditioner in your home. Variety of Features In contrast to conventional heating and cooling systems, mini-splits offer an assortment of great features aimed at boosting convenience. Most systems are equipped with remote control operation, which is necessary when air-handling units are installed in out-of-reach locations. Programmable timers let homeowners utilize heating and cooling capabilities only when necessary. Airflow can be adjusted for optimum room temperature, and washable filters make maintenance a far easier undertaking. For dual heating purposes, the introduction of a heat pump can provide automatic changeover for heating in winter months. Multiple Operating Modes Mini-splits also provide a number of operating modes. While heating and cooling are standard in many HVAC systems, mini-split systems include the ability to dehumidify a room. This can be ideal for moisture-laden climates which can create an uncomfortable atmosphere in a home, in addition to degrading fixtures over time. A fan-only option is also available, as well as automatic and sleep functions. Increased Energy Efficiency For those seeking increased energy-efficiency, ductless systems can prove quite useful. Ducted systems can lose up to 30% of energy thanks to faulty construction. This loss can contribute to higher utility bills, while also failing to adequately cool every room in a home. Ductless systems can be utilized on a room-by-room basis, giving homeowners greater control over the temperature in their home, as well as help them save money on utility bills. Improved Air Quality Another great benefit of mini-split systems is the improved air quality. Ducted systems are notoriously known to have debris accumulate inside the ducts. Due to condensation within ducts, this debris can quickly become toxic, and possibly find its way into the “cool” air that gets distributed throughout your home whenever your air conditioner kicks on. By removing the ducts, homes are privy to cleaner, healthier air overall. Ductless systems are also far easier to access thanks to their unique construction, which makes routine cleaning an easier task. Learn More About Ductless AC Benefits An Advanced Solution to Cooling Your Home For those seeking more efficient functionality when cooling their homes, ductless air conditioners have a lot to offer. Obvious benefits like increased energy-efficiency and improved air quality are coupled with highly useful additional features, such as auto-restart after a power outage, as well as multiple fan speeds for easier customization. When coupled with heating capabilities, a mini-split ductless system can prove useful in a home all year round. While mini-splits may not be suitable to all situations, their increasing existence in many homes and businesses proves just how valuable these systems can be in many circumstances. If you are seeking a more efficient way to cool your home, ductless air conditioning may be right for you.
jody says May 28, 2015 at 9:46 pm prices for a 800 sq ft home for heating and cooling. For two rooms Reply
Neil says March 23, 2018 at 8:29 pm If you buy off the internet, $2500 plus labor of $3000 but no warranty. To get a warranty, you have to buy from a dealer. Dealer is $3000 plus $5000 labor, but you get a warranty. read the manufacturer’s warranty, only. Reply
Troy says June 29, 2018 at 12:53 pm No Way are they that much, I just bought two LG Art Cool Mini-Splits, a 12K BTU & a 9K BTU unit and paid about 3,000 – 3,100 for the units, wiring, drain hose etc. An I installed both units over a weekend myself. And if some outfit wants to charge that much, go find someone honest. Reply
Jane says October 16, 2018 at 2:00 pm Hi Troy, could you let me know where you bought yours? We want to do the installation ourselves too, thank you! Reply
Eric Roenisch says February 1, 2020 at 9:44 am 1 and 1/2 ton daikin with one condenser and an evaporator head in each room with installation would be $5500.00 if you are in northeast florida we can install it. If you live in another region you will have to call another company Reply
Brian says November 26, 2017 at 7:11 am They aren’t overly difficult to install if you have some basic electrical and flaring skills. The tools however are very expensive. I discovered after my install that a normal flaring tool doesn’t work for refrigeration. Had to pull it down and reflare after borrowing the proper tool. And you need someone with a vacuum pump setup to test the system for you prior to opening the valves. Reply
Jim says July 15, 2020 at 6:17 pm Do you have to vacuum them down and put a charge on them or can you just hook them up and fire it up Reply
Eric Roenisch says February 1, 2020 at 9:50 am A homeowner cannot install a mini split system because only a licensed hvac company knows proper procedures having to do with codes and evacuating line sets with vacuum pumps. All noncondensibles and contaminates have to be removed before letting charge goes in system. Also have to have k knowledge of refrigerant saturation temperatures. These things are the reason that we go to school for years to learn. Reply
Olivia says July 30, 2015 at 8:58 am Great post about split-system air conditioning. I like how you mention the improved air quality offered by ductless systems. It sounds like this would be a good idea for anyone who is allergic to mold or dust. My friend Jaime is allergic to dust. I wonder if she has thought about this type of AC system. Reply
Paul says June 27, 2019 at 2:42 pm The see-through flimsy filters that are ubiquitous on mini split cassettes don’t even filter out enough dirt to keep the coil and blower wheel clean. Reply
bryan flake says August 5, 2015 at 2:32 pm My grandparents are trying to install a split air conditioning system the one where part of the system is in the house and the other part is outside? My grandparents need this new system and found asbestos in the wall when they were going through it. I really don’t know what we can do now to help them resolve this and still go forward with the air conditioner. Reply
pat says July 18, 2017 at 12:42 pm Whatever is in the wall … will NOT affect the conditioned air … at all. What is in the wall … stays in the wall. What is in the room … stays in the room. GOD Bless. Reply
MARIO says February 5, 2018 at 12:41 pm NOT TRUE. CHINESE DRYWALL WILL AFFECT THE UNIT. IT IS A WELL KNOWN CULPRIT OF LEAKING EVAPORATOR COILS. Reply
Paul says June 27, 2019 at 2:44 pm Chinese drywall fiasco: https://en.wikipedia.org/wiki/Chinese_drywall Reply
Jimmie Roan Sr. says July 3, 2018 at 11:20 pm i worked for an large environmental company in the city i live in, the asbestos craze made millionaires out of many that got in quick, fizzled out and left many companys broke, except for the ones that looked ahead, yes it is harmful, don’t shake it up and breathe it or rub your face in it, i would take a can of spray foam and isolate it inside the hole if your worried. to help overcome the fear, go look at homes in your city with aluminum siding, most put the siding over asbestos siding in place, mine was done in 1989, im 76 and still kicking. Reply
Zequek Estrada says June 14, 2016 at 7:44 pm I didn’t know that ductless air conditioning system was also known as mini-splits. huh, today I learned. Reply
Dale says April 2, 2020 at 6:11 pm I have a four unit mini split if I hook up 3 of the 4 can I still run the 3 Reply
Jblb says September 1, 2016 at 8:35 pm Can I use a ductless mini split in an airtight music studio? Other than opening the door periodically, there will be no outside air intake. Reply
mike says September 13, 2016 at 8:45 pm Shouldn’t have any problem using a mini split to maintain your airtight conditions as it just cycles air in the room through the return and out the supply. Reply
Ai says November 15, 2017 at 4:43 pm That is not ideal; I’m in the same situation, and designers and architects keep insisting that I install it with a ventilation system as well, like an ERV or HRV. Such a ventilator brings in fresh air and exhausts stale air. An HVAC specialist can calculate the right volumes and air flows. Reply
WILL says April 24, 2018 at 1:46 pm your question is simple yes you can use a ductless unit in a studio. But it will not bring in outside fresh air. which is not a big deal. When ever you open the door fresh air will be let in. Reply
Hal Lewis says December 23, 2016 at 11:55 am Mike, My concern is about fresh air and renewed oxygen supply into the room if there is no exchange air from outside the building. Please tell me I am missing something. Otherwise this system will be excellent to replace my central ducted (smelly) A/C system. Reply
Lsd says March 8, 2017 at 8:34 pm Yes…these are commonly used in this environment i.e. grow room where higher co2 levels are desirable. Reply
Dawn Skewes says March 30, 2017 at 9:28 am Can these systems run all the time to keep the area at a constant temperature? We converted our carport to a playroom/den which is in use always. It is about 500-600 square feet. Reply
kim says July 8, 2017 at 3:52 pm How cool can a mini split system cool my house? For example if it’s 100 degrees outside, will it still remain cool inside? I’ve been told that a mini split will only cool a house 20 degrees below the outside temp. Is that correct? Reply
jacqueline jacobson says June 27, 2018 at 6:48 am My mini split does NOT. They are only good for a very tiny part of your home. In other words, if your standing/sitting right underneath it, then you can feel the cool air, and that’s it. What good is that when it gets to 115 in the summertime where I live? I hate mine. Would NOT recommend! Reply
Eric Roenisch says February 1, 2020 at 9:56 am What you need to figure is tonnage an average base to size tonnage is for every 400 square feet you need 1 ton of air conditioning Reply
Chris Higgens MEP, TBT, TBE. PE says May 15, 2019 at 11:59 pm I just ran across this post and I am sure you have an anwser by now but here we go… Most systems cool between 18 to 24 degrees. This is entering air temp and leaving air temp of the unit and not the outside air temp. If you were using a 100% O/A system then he would be correct however you have return air from your space and not using the hot outside air. I have had a tech tell me well it is 100 degrees outside so your house can not get to the 74 you are trying to achieve. The system was not installed right and was operating at high speed 2nd stage cooling but only running first stage cooling outside therefore the system could only achieve a 12 degree temp drop. As for the music rooms above … the mini split system is fine for the room however fresh air will need to be added to the room by either an ERV or an inline fan the draws from another space in the building that has fresh air supplied to it and delivered into your room. Reply
Pepper Rae says August 15, 2017 at 2:18 pm It’s a great idea, but why are they so darned EXPENSIVE? It’s not worth buying a single unit when an entire system can be purchased for less. I don’t understand the reason for the high price tag. Reply
WILL says April 24, 2018 at 1:40 pm Yes it can be installed under a window. As long as the unit can drain water out of it should be fine. Reply
Nancy Jones says October 22, 2017 at 10:50 am How do I get an air Exchange? Should I open windows daily or run my air exchange unit. If so, how often. We have a mini split in a mini home. Not adequate food r size of home but see how it goes before spending more money. Maybe electric baseboard heating can fill in cooler rooms if necessary. Thanks for your input. Keep this explanation simple. Reply
Kevin says November 18, 2017 at 12:56 pm You should look for split units with precharged gas lines and wiring. Also quick connects on those lines is a big help. I bought a Rolling Cool mini split and even though it not killer cold it works ok and it was a part a indoor part b outdoor plug in and run. It has a 110v gfci plug on it already. Reply
curtis says December 18, 2017 at 9:29 am We installed a 5 head Fujitsu system in our NH 2 story colonial .. 3 head upstairs in the Bedrooms and 2 down at either side dinning room and den.. In the past we had window units. The mini split has cut our cooling cost in half, we only use the heat for really cold days as we have baseboard forced hot water heat which sucks for the most part. Reply
Marisa davis says January 30, 2018 at 10:18 am How many vents can one compressor work without having any problems? Reply
Eric Roenisch says February 1, 2020 at 9:59 am That depends on the size of the vents and the capacity of the compressor Reply
Arnie Kwiatkowski says February 18, 2018 at 1:07 pm I’m going to buy a mini split a.c. system for my growroom! I’m using a portable a.c. unit now and it creates a vacuum in the room which sucks all the co2 out! I think a mini split a.c. setup will solve this problem! Reply
WILL says April 24, 2018 at 1:36 pm ANY ONE WHO IS NOT EPA CERTIFIED TO HANDLE REFRIGERANT. IF CAUGHT INSTALLING A UNIT WILL BE 5,000.00 FINE. IT DOES NOT MATTER IF YOU ARE A HOMEOWNER EITHER. THIS WORK MUST BE DONE BY A CERTIFIED TECHNICIAN Reply
burt says May 16, 2018 at 12:57 pm american standard mini split unit. does the interior unit fan run all the time and only runs the compressor when cooling or heating is needed? Reply
Cathy Smith says May 26, 2018 at 10:15 pm We purchased one outdoor 4 unit and 3 indoor unit in 2015. Worked great until last week and one indoor unit went completely blank nothing on led. Called the company 3 times and got the tech voice mail and still no return call. It is very hot in that room which is a bedroom. Now tonight another bedroom unit went out. Don’t know why the Seer company will not return calls. Not sure what to do at this point. I expected the whole set up to last more than 2 years. Reply
Jason M says June 5, 2018 at 5:20 pm A concerned HOA has disallowed our remodel to use a minisplit due to noise factor as we’re told they can hit 40 decibels. Can the split unit be placed in the garage to avoid the ambient noise pollution? Heat only… Reply
leslie says June 7, 2018 at 11:56 am I have a 8 split condenser and a 2 split condenser. The 2 split, you can’t hardly hear. The 8 split ain’t much louder. I would tell your HOA to shove it! Reply
Jimmy says July 12, 2018 at 12:12 pm I want to convert my system to ductless over time. I want to start in the garage with no duct work at all. Can a larger 8 split system be scaled or do I need to do it all at once? Reply
brian says July 13, 2018 at 9:11 am Will this type system work for a 3500 sq ft room? 9′ ceilings and well insulated. Reply
Ezzy Sanders says July 14, 2018 at 6:38 pm I need a heat/ac unit for a 400 sq ft. apartment on the 4th floor of a historic mill building. I’m unable to use a window, or to have anything show on the outside of the building. Everything must be contained within. Is this possible? Any ideas welcome! Reply
Kevin says July 22, 2018 at 6:29 pm I just had a Mitsubishi mini split installed and I love it. I wanted to know does it automatically shut off when the room temperature reached the mini split setting. Yes I have it in auto mode. Reply
Nav says December 31, 2018 at 9:29 am It has a thermal sensor that scans the room for set ambient temperature. Reply
KC Wallace says August 30, 2018 at 1:44 pm We just got the ones that go in the ceiling .the cassettes .4 separate techs we have called to install and keep getting a run around..one excuse was he just has never done one like that so he wasn’t comfortable doin it ..1 said the only time he installed one of those was a nightmare and ended up with giving a refund to the customer and an ac that didn’t work efficiently..said the drain is too hard to comply .couldnt keep the condensation out and when it did it would clog .$2500 piece of trash is pretty much what he said we got and won’t do it ..3rd one has rescheduled us for the 3 rd time as if they’re trying to avoid the install !..4th just won’t return the phone call ..one of them warned me that a local tech that has done one left the final product with a 5 gallon bucket inside each of the rooms for the drains ….has anyone had success in these and how if so .i do not plan on having buckets set in my photography studio for drains ! And certainly not happy paying such a big amount for a so called”expensive plastic trash”.please help . Reply
Liz says September 17, 2018 at 9:20 pm A caveat: These units are difficult to clean. If you get mold in them sometimes not possible to clean effectively — paid a contractor $650 (the going rate — got three different bids) and no change in the smell, then 2 weeks later the white telltale signs of mold are back on the blower wheel. It’s really a drag since I like the units for 10 yrs with only one repair. Live in northern Virginia so humid but not crazy humid. Here’s the suggestion: always run the units. Don’t change the temperatures more than 1-2 degrees (so they stay running). Keep the house to 50% humidity. But there’s the trick — the dehumidifiers increase the temperature of rooms which create the ideal environment for mold to grow — moist and warm. If someone has better ideas, please post. Reply
Monica Ashley-Nguyen says September 30, 2018 at 11:32 am Should the mini split run all the time? I live in Florida and have installed one in a addition. Should the unit be turned off when we are not at home? Or should it be left on 24/7? Reply
beryl mcclerren says September 30, 2018 at 7:37 pm Can the “outdoor” unit be placed in a covered, screened space with concrete floor? Reply
Bill Crawford says November 14, 2018 at 10:46 am What a waste of my money! Bought the larger Trane mini-split system to heat and cool an 800 sq. ft. well insulated garage and workshop. It seems to be halfway decent on the cooling end if it is not extremely hot but always have to adjust it temp wise. The heating in the winter sucks if it gets below 20 degrees. Won’t heat up the shop over 65-66 degrees.Have to use supplemental elect. heater $. Wish I would have known this when I had it installed by my very reputable ac/heat service. Heat pumps suck in the winter when very cold. Any ideas? Reply
HVAC Guy says November 29, 2018 at 8:19 pm What size/BTU is “larger”? What is the HSPF of the unit? Some Minisplit heat pumps will struggle below 37F and some will still pump heat at -20F. You have to get the right equipment for your needs. Reply
Ricky Pope says December 18, 2018 at 5:43 am I just installed two Mitsubishi mini splits each with two heads in our trailer at the coast. During the winter we don’t go much and have one head off each unit running at 50 degrees with the other head cut off. Still learning on best way to run this. Would or should I keep both heads running or is it fine like I’m doing? Reply
