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Frequently Asked Questions



This section answers questions about our Mitsubishi heat pumps

Q. How big is the new M-Series indoor unit?

A. Mr. Slim's indoor unit is compact and mounts discreetly high on the
wall where it is mostly out of view.

Q. How big is the new M-series outdoor unit?

A. Mr. Slim's outdoor unit is not bulky like the conventional style units you are used to seeing. The unit's very thin profile allows it to be mounted discreetly along the back or side of the home. Because the height is minimal, a small planting of shrubbery will also keep it from plain view for a more pleasing appeal. Please refer to table below for actual dimensions.

Q. How quiet is Mr. Slim?

A. Mr. Slim is designed to be quieter and more efficient than old window units, so you'll sleep easier with less worry about operating costs. The unit's fan is designed to deliver air quietly with only a gentle whoosh.  (That's why Mr. Slim is the first choice for thousands of churches, schools, and libraries.)

Q. How does Mr. Slim work?

A. Mr. Slim employs the same mechanical components as any basic air-conditioning system whose interactions cause the process of evaporation to occur. Mr. Slim is a split-ductless design, which simply means the indoor unit is separated from the outdoor unit and is connected by a gas and a liquid refrigerant line. The outdoor unit is considered the hot-side during the air-conditioning process. The cold-side unit is located indoors. In the heating process the compressor reverses this operation, and the heat energy is evaporated in the outdoor unit.  Then the indoor unit collects this heat energy while a fan blows air over the indoor coil and distributes the warm air into the room.

Q. What are the installation considerations for mounting the Mr. Slim M-Series indoor and outdoor units?

A. The indoor unit is typically installed high on an exterior wall. An exterior wall allows for easy connections between the indoor and outdoor units. The indoor unit is suspended on a wall bracket that is first mounted and secured to the wall. Because the indoor unit is so light, there is not significant pressure placed on the wall. The indoor unit is mounted horizontally and must be leveled. For the best circulation and air distribution the unit should be at least seven feet high or six inches below an eight-foot ceiling.

The outdoor unit should be mounted in a convenient location to allow for easy connection to the indoor unit. However, you can place the outdoor unit up to 49 feet away from the indoor unit if you wish. The outdoor unit can be placed close to the wall but must have at least a foot away. The outdoor unit should be mounted on a concrete pad to assure level footing. The fan outlet should be facing away from the home or the unit can be mounted perpendicular to the wall.

Q. What color is the M-Series indoor unit?

A. The units are white with varying degrees of brightness across the product line.

Q. Why do you need a three-inch opening in the wall to install Mr. Slim?

A. Unlike window units or hotel style units, which require a large wall or window opening to be cut, Mr. Slim only requires a three-inch round opening. This opening in the wall is necessary to allow the refrigerant lines and the wiring to connect the indoor unit to the outdoor unit. This opening is sealed and insulated by your installing contractor so no drafty air leaks or water from outside get in.

Q. What is the I FEEL mode on the M-Series remote controller?

A. This answer applies to all newer M-Series equipment. This function samples the indoor temperature for 2 minutes and then based on that temperature chooses the mode the unit will operate in. If the temperature in the room is more than 79 degrees it will be set in the Cool mode at 75 degrees. If the room temperature is 77 to 79 it will be set to the Cool mode minus 4 degrees of the current room temperature. If the temperature sensed is 73 to 77 degrees then the unit will be set in the Dry mode minus 4 degrees of the current room temperature. If the room temperature is less than 73 degrees then the unit will be set in the Heat mode. In the "I Feel" mode the temperature display disappears and pressing the "Too Warm" or "Too Cool" button will change the set point by 2-4 degrees.

Q. Why should I consider buying Mr. Slim?

Mitsubishi Electric is the industry leader in ductless air conditioning technology. Our innovations have defined cutting edge technology for years. Compare and you'll see no one surpasses Mr. Slim's performance for quiet, easy-to-use energy efficient operation. And since our ductless technology carries the Mitsubishi Electric name, you know every unit is built to last. The bottom line is that Mr. Slim delivers the ultimate control of comfort for your home or office. It's true today and will be comfortably self-evident for years to come.

Mr. Slim provides all of these important benefits:

  • Quiet and efficient operation: Mr. Slim runs at as little as 26 dB(A). This means that you can hold a quiet conversation or sleep without having to worry about the air conditioner interrupting you.
  • No ductwork is required: You will not have to tear up walls or add expensive ductwork to basement remodels
  • Will not take up a window:  If you take as much pride in your landscape as you do your home, you will appreciate that you can enjoy your handy work from the inside now that you have gotten your window view back. If you own a window unit then you are also concerned with the security issue of someone taking it out and coming inside your home. Mr. Slim eliminates this concern.
  • Effective zone cooling and heating: True zoning means that you can tailor individual rooms to your personal comfort tastes. Perhaps you prefer it cooler in the bedroom or kitchen. Also if do not use your guestrooms, dining room, or bonus room regularly, why cool them day-in, day-out?
  • Versatility: You can air condition spaces you at first thought impossible because there is no space for ductwork and you don't want a window unit. Both at the home or office, Mr. Slim is flexible enough to work in almost any room environment.
  • Remote controlled operation and timer functions: With Mr. Slim, you can control your comfort from across the room. The M-series comes with a wireless remote controller that gives you control of temperature, fan speed, vane operation and more. Plus a timer function means that you can set Mr. Slim to operate when you need it to. For example, if you know you arrive home from the office around 6:00 PM, you can set Mr. Slim to turn on at 5:00PM to begin cooling before you get there. This means that you are not cooling or heating your home while you're not there, which saves you money.

FAQ's regarding our Fujitsu heat pumps

What is a ductless mini-split system?
A ductless mini-split system is comprised of an indoor unit called the evaporator and an outdoor unit called the condensing unit.  The evaporator is connected to the condensing unit by copper tubing and electrical wiring which is passed through a 2 ½” – 3” hole.  Basically, it is a small central air unit with the flexibility of cooling or heating one room or more; zoning.

What are the advantages of installing a Fujitsu ductless mini-split over a central air system?
1) With Central Air you must cool an entire home when only one room may need cooling.  On the other hand, ductless mini-splits cool only the areas you want and not the areas you don’t.  
2) 18,000 BTU is a typical minimum central air unit.  With ductless mini-splits, you can use 7,000, 9,000 or 12,000 BTUs.  
3) Typical 3-ton homes are not zoned or require complex zoning systems, which makes it very expensive for the homeowner.  With ductless mini-splits, multiple evaporators make zoning as simple as setting a remote control.  
4) Energy wasted in long lengths of uninhabited ductwork means higher energy bills.  Less than 5% cooling loss occurs in insulated refrigerant lines compared with up to 25% through ducts.  
5) Retrofitting homes requires cutting holes in walls, floors, ceilings or decreasing closet space with ducts.  Ductless mini-splits requires just a 3 or 4” diameter hole in the outside wall.  Means less mess and better home aesthetics.

How long has Fujitsu been manufacturing ductless mini-splits?
For over 35 years Fujitsu has been working hard to make the world a more comfortable place.  We have produced and shipped millions of air conditioning systems throughout the world, making the hottest places cool and the coolest places more comfortable. 

What color do Fujitsu’s ductless mini-split systems come in?
Each Fujitsu ductless mini-split wall mount model is offered in one standard beige color.  Alternate colors are not available.


 Purchasing Questions

Where can I purchase a Fujitsu mini-split system?  
A consumer can purchase a unit from a Fujitsu Authorized Contractor.  Here at Arsenault's Satellite, we are proud to be one of Fujitsu'e Elite contractors.  

What are the prices of your mini-split systems?
To find out prices, please contact us at (207)743-6926 or use the contact form on this site

Can I purchase from an online dealer?
No, Fujitsu doesn’t recommend buying our units online.  The warranty becomes null and void for online purchases.  Fujitsu General America has enforced a non-retail Internet Sales policy. Fujitsu's full line of Halcyon ductless mini-split heating and cooling products specifically excludes products purchased through on-line retailers and resellers. Fujitsu does not authorize online retail sales of any of its products.  Our authorized distributors are able to operate password protected sites to sell Fujitsu products to qualified technicians.

 Warranty & Tech Support

What is the warranty?
2010 models have a 2 year warranty for parts and 6 years for the compressor.  2011 and beyond models have a 5 year warranty on parts and 7 years for the compressor.  Please see the Warrantypage for a full listing of models and their warranty periods.

Who can I contact for technical assistance?
You can contact us at (207)742-6926, please leave a message after hours.


Can I install a Fujitsu mini-split myself?
No.  Only an authorized certified HVAC contractor can install Fujitsu units.



Do I need to clean the unit?  If so, how? 

The dust filter in the indoor unit should be removed and vacuumed or washed regularly to maintain the performance of the system.  An annual deep cleaning, which we offer, is also recommended.
Detailed instructions for maintenance can be found in each model’s Owner’s Manual.  


What is SEER?
Seasonal Energy Efficiency Ratio; a measure of cooling efficiency for air conditioners and heat pumps.  The higher the SEER, the more energy efficient the unit.  Energy efficiency equates to lower electrical bills.  Currently U.S. Government’s minimum SEER rating is 13. 

What is a BTU?
British Thermal Unit.  Used to measure cooling or heating capacity;  the amount of heat required to raise or lower the temperature of 1 lb of water 1°F.