A greenhouse might be your best choice to position your hot tub. This is especially a good idea if you lack indoor space or need to enclose your hot tub.

The whole purpose of having a hot tub inside a greenhouse is to protect and keep the air warm. However, you are probably wondering if there are any downsides to having your hot tub inside a greenhouse? Let’s try to answer some questions.

So, can you put a hot tub in a greenhouse? A greenhouse can be a good cover for your hot tub. You will need good ventilation and make sure there is enough space for the spa and access around it. 

Possible downsides are:

• overheating in the sun
• getting the hot tub through a narrow passageway

It seems that the most important thing to consider when installing a hot tub in a greenhouse is the steps you need to take in advance. As a rule of thumb, simply placing the spa in the greenhouse is not enough. There are many things to be done, measured, examined, or observed before your spa is safe and ready to be placed in the greenhouse.

What are Downsides Of Putting Your Hot Tub in a Greenhouse?

The biggest problem I can see is the bromine anti-algae, anti-bacteria stuff can damage the plants. Other than that it seems like a very good idea. You could use some vacuum tube solar collectors to keep it hot too, saving a lot of money on heating.

You should probably still use a cover to keep the tub warm. most of the heat loss in a hot tub is due to evaporation.

Another problem is humidity. Hot tubs produce a lot of heat and humidity becomes the problem. It is interesting that the hot tub temperatures are regulated a lot by the room temperature. When your room is cool the hot tub is cooler. I know that sounds backward but it’s true. 

So you are constantly turning your hot tub heater up or down.

Can you Buy a Greenhouse Specially Made for Hot Tubs?

Many people put their hot tub in focus and build things around it. Some build a greenhouse around their hot tub. 

The best time to start with a hot tub greenhouse is when seedlings start inside and then you want to bring them outside to acclimate them. You can put them around the hot tub and close the doors at night and open in the daytime. So I guess people do just the opposite instead of a hot tub in a greenhouse, their hot tub becomes the greenhouse.

With that being said, you could definitely buy a greenhouse specifically made for your hot tub. It can be a benefit to your hot tub as well as your plants, assuming your plants like humidity and warm environment.

Is it Easy To Put a Hot Tub in a Greenhouse?

Of course, installation on the inside comes with some added complications compared to the outside, so we’ve put together some questions and answers for you. These tips apply to all hot tubs in any indoor space, including a greenhouse.

1. Choose the right model. Some hot tubs are better suited for indoor use than others. For best results, consult with a qualified contractor or architect to find the best specifications of the model you choose. If you are building a new space, leave a large opening for the hot tub. It is best to install the hot tub before closing the last wall.
2. Watch your step. Avoid floors that become slippery when wet. Believe it or not, you get a pint of water when you leave the hot tub, and most of it flows to the floor. Choose a floor material that provides good traction and drainage even when wet. This doesn’t include wood or carpet, which will rot, or “Astroturf” plastic turf carpet, because water can seep underneath and rot the pad. The best option is a matte, non-slip tile. HOT TIP: Install a drain in the floor to facilitate cleaning and draining the spa.
3. Go with the flow. Install a hose connection in the room for easy filling.
4. Plaster. A tight cover keeps moisture in the spa, but when the cover is removed, the room heats up quickly. Cement walls, glass covers, and cedar siding are among the best choices for wall material. You can also use waterproof drywall, which is made for bathrooms and kitchens.  HOT TIP: Install an intact vapor barrier under the wall covering to prevent dry rot on studs and joists.
5. Fan on. You’ll need a good, quiet fan to draw any extra moisture out of the greenhouse quickly without disturbing the peace and quiet of your hot tub and damaging your plants. This is the most important part to prevent the walls and structural elements from rotting dry or having too much moisture in your greenhouse. The usual hardware store fan is useless, noisy, and soon its rust will stain your walls or ceiling. Make sure you have a fan with a timer, thermostat and humidity control, all in one unit. TIP: Consult an HVAC professional to find the right size, choose the right place in the greenhouse and install the fan correctly.
6. Heats the room. To minimize moisture condensation, make sure the room is heated properly.  A fan will improve air circulation.
7. No smells allowed. There is nothing worse than the musty smell of chlorine filling your greenhouse. The chlorine smell will escape from the spa every time, even if you use the fan. HOT TIP: The SilkBalance toilet or the new ACE salt system is the only way to disinfect indoor spaces.

Should you Put a Hot Tub in a Greenhouse?

I once housed some of my seedlings in a friend’s hot tub room. It used to be a greenhouse, so the walls and roof were covered with fiberglass greenhouse material. The plants loved it. There was plenty of moisture in the room, the tub provided extra heat at night, and I bet you could really speed up germination by using the tub cover as a germination mat.

I’ve always wanted to add a hot tub room to our house, with walls and roof made of Lexan and a brick floor with a drain. Maybe I could grow some tropical plants there too.

So should you put a hot tub in a greenhouse? There are many benefits to having your hot tub inside your greenhouse. Your seedlings will benefit from the warm and moisture air inside your greenhouse.