Determining the Right Size BTU or Ton Air Conditioner Required Per Square Feet of Space

The following table provides a guide for choosing the right size air conditioner based on the area needing to be cooled. The Air conditioner output and capacity is measured in BTU per hour. This chart includes areas from 100 square feet up to 2,500 square feet for comparison.

Area To Be Cooled (square feet) Capacity Needed (BTUs per hour)
100 up to 150 5,000
150 up to 250 6,000
250 up to 300 7,000
300 up to 350 8,000
350 up to 400 9,000
400 up to 450 10,000
450 up to 550 12,000
550 up to 700 14,000
700 up to 1,000 18,000
1,000 up to 1,200 21,000
1,200 up to 1,400 23,000
1,400 up to 1,500 24,000
1,500 up to 2,000 30,000
2,000 up to 2,500 34,000

Additional Considerations

  • If the room is heavily shaded, reduce capacity by 10 percent.
  • If the room is very sunny, increase capacity by 10 percent.
  • If more than two people regularly occupy the room, add 600 BTUs for each additional person.
  • If the unit is used in a kitchen, increase capacity by 4,000 BTUs.
  • Consider where you install the unit. If you are mounting an air conditioner near the corner of a room, look for a unit that can send the airflow in the right direction.

Measuring for Central Air Conditioning Systems in Tons

The basic formula for determining the required tonnage of a central air conditioning system is as follows:

( ( House square footage times 30 then divided by 12,000 ) – 1.0 ) = Required Tonnage

If you live in an area that has higher temperatures during the summer (such as 110 degrees in the desert) then don’t subtract 1 in the formula above.

To determine a more accurate size for your region, use the chart below.



Sources (as of 11 May 2017):

American Tiny House Association – Board of Directors

Palmetto, FL (December 12, 2016) — The American Tiny House Association (ATHA) has elected its 2016-17 board of directors. Details are below.

About the American Tiny House Association

Founded in 2015, American Tiny House Association is the premier organization dedicated to ensuring tiny houses are accepted as viable dwelling units. Members advocate locally and nationally, providing education and support to enthusiasts, municipalities, key housing organizations, builders and other professionals to help people to legally live tiny.

Benefits of membership include access to resources, solutions to building and zoning codes, connections with city planning and construction experts, and the tools to engage with local governments. For additional information, visit the web site at

Board of Directors


President: Chris Galusha

Galusha is a construction consultant and advocate for safe, affordable housing. Since 2010, he has focused on the tiny house industry and works to teach and mentor those interested in construction, regenerative agriculture, and land development. He is currently director of construction for a veterans organization, developing tiny home plans and construction training programs in the Dallas, Texas area.


Vice President: Amy Turnbull

Turnbull studied community development and housing as a graduate of California State University and brings her passion for tiny to ATHA. She is an advocate of accessory dwelling units (ADU) and hopes to build an ADU on her property in Great Barrington, Mass.


Treasurer: Lisa Ward

Ward is the founder of She has worked in private commercial and residential real estate finance industry and government sector for more than 20 years, with a focus on partnerships for affordable housing, mixed use development and land preservation.


Secretary: Ginger Reichl

Reichl is the CEO of Parvus House, a tiny house design firm, and is president of Pinstripe Marketing in St. Petersburg, Fla. She is an advocate for tiny homes as an opportunity to solve a variety of problems including transitional housing communities for the homeless, veterans, youth aging out of the foster care system and more.


Director: René Hardee

Hardee transitioned from a mere tiny house enthusiast into a true tiny house change agent by petitioning her town of Rockledge, Fla. to create a brand-new, tiny house community zoning ordinance, and is currently building the city’s first tiny house community.


Director: Aaron Kipfmiller

Kipfmiller is the design and construction manager for Great Lakes Tiny Homes in Jackson, Mich. Responsible for conceptual designs and construction documentation. He also manages the zoning intelligence service to provide detailed analysis of zoning requirements for potential property locations.


Director: John Kernohan

Kernohan and his wife, Fin, live in a 304 square foot tiny cabin in Eatonton, Ga., and host the Facebook blog, “Beloved Cabin.” They also created and continue to plan and manage Tiny House Festivals, and regularly contribute to blogs, presentations and other publications about tiny living.

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Tiny House Q&A: Where can I find a local small house builder?

Q: Where can I find a local small house builder?

A: On our website we have a directory of designers and builders, as well as a listing of local contacts.

However, because the small house movement is still relatively new, it’s unlikely that there’s a small house builder located in your community.

What people typically do is contact a local contractor or local builder in their area. That person can be the local builder and work with house plans from one of the national designers. Even if they don’t have extensive experience building tiny homes, they have the tools and experience needed.

Another option would be to purchase a ready-made tiny house and have it delivered to you (or go get it from a builder).

Converting Bamboo into Bamboo Cloth & Bedding

The journey from a bamboo stalks into a yard of soft bamboo bedding results into 100% organic bedding that is both environment and skin friendly. This chemical free conversion process helps you sleep comfortably in the Night that helps your skin to breath all Night. Below is an elaborate process in the form of infographic by which organic bedding manufactures convert the bamboo grass into fine bedding.
Converting Bamboo into Bamboo Cloth & Bedding

This Infographic is created by Cozy Earth talks about manufacturing of products like Bamboo sheet, Bamboo comforter and silk sheet.

Your Home Is Your Castle, No Matter Its Size

We all know our homes come in many sizes and shapes. The castles, mansions all the way down to the condo, apartment, modular, mobile, or the Mini, Small, Tiny, Miniscule etc. They all have one thing in common….

The amount of floor space or sq. footage is what we all have to presently live/work within its confines unless we add more outside dimensional space. These dimensional changes are usually special designed roofs to make attic space, tip-out in walls and/or windows such as bay windows etc., adding room additions, and even adding a basement/cellar to get more living/ working space.

Those restrictions/solutions may not be all the options. Presently, there is patent pending construction/design options to possibly allow anyone to add extra living/working space that a home has without adding any outside dimensional changes to an existing home…regardless of its size.

I am not talking about padded storage boxes that act as kitchen seats, or beds that are atop of a storage locker, or closets buried in all the different wall spaces, or pull down beds etc. Nor am I talking about the sliding walls or sliding storage shelves that you may have seen elsewhere either. I am talking about patent pending new ways to actually provide you an addition 25-40% more living/ working utilization space within the set confines of the sq. footage that you have to live with.

I am not at liberty at this time to go into a lot of details. However, I will share more specific information (same narrative information presented to Provisional Patent Office), with those that contact me. I would like to know if there is an interest in this or not, as I am in the process of building a table model top model (about 90% finished), showing the basic concepts in action.

Yes, I am the inventor of these concepts, and I am very interested in talking with those that are interested and/or wanting to pursue what I feel would be a very profitable business development agreement. The options are vast and world-wide in scope.

My email: is I would enjoy hearing from you as to your level of interest. I promise I will do my very best to reply to all those that contact me in a very timely manner.

Thanks for your time and interest in reading this. I hope to have a video completed in early 2015.

Lee Marcum


Land Caretaker Opportunities Directory

Many of you responded positively to the post from Janet Thome of Tiny Portable Cedar Cabins about her need for a caretaker. As a result of the overwhelming response she received, Janet assembled the caretakers opportunities list below for those still seeking a land caretaker opportunity.

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2 December 2014

I am very excited regarding all the interest in my Caretaker position and the other possibilities for my community in Marlin, Wa. The only bad thing is I cannot take everyone and it will be very difficult to choose. I want to thank everyone who shared my post, I am very grateful. I am going to take my time on deciding,  so please feel free to contact me. I will spend the next few weekends talking to people.

Because I cannot take everyone, I would very much like to help pass on some  information where there are other communities and care taking  possibilities. The fact that my post wanting a caretaker was viewed over 97.000 times tells me there is a great need and interest. I hope these resources help others.

The Caretaker’s Gazette

The Caretaker’s  Gazette is a wonderful resource to find care taking positions all over the world. It is very affordable to get a yearly subscription. You can put an ad in if you are seeking a position or if you need a care taker. They also do regular emails listing new opportunities.

Intentional Communities

Intentional Communities is a website listing intentional communities all over the world. They usually have their homes and land established and are often looking for workers and members to join. You can list a free ad.

Workers On Wheels

Workers on Wheels is a free resource to find paying positions as a care taker or a camp ground host if you have your own RV or tiny house on wheels.

New Community Outside Of Eugene

There is a new Tiny House community forming 2 hours from Eugene, Oregon in a very rural location. It is on 10 acres and it will have full hook ups for tiny houses and RV’S.  It is so new it does not have a name yet, but I am going to work with the owner to send people his way, so please contact me if you want to know more about this community. He does not have a website yet. I will add more information as I get it.



Janet Thome is the proprietor of Tiny Portable Cedar Cabins in Marlin, Washington.