How to Keep Your Greenhouse From Overheating? (2024)

Does your DIY greenhousekit feel like a sauna in the summer months? Are you struggling to keep your delicate plants from wilting, sweating, and drooping despite your best efforts?You are not alone.

Polycarbonate greenhouses are designed to soak up the sun and keep your growing space warm and cozy throughout the seasons. While this works wonders for extending your planting season into the winter, managing the heat on those sweltering summer days can be challenging.

The good news is there are countless ways to lower your temperatures, upgrade your DIY backyard greenhouseand ensure your plants are thriving during the sunniest months!

To kick off this growing season, we’ve compiled our top tips and tricks to keep your greenhouse from overheating.

First and foremost, it’s essential to understand what the perfect temperature for your DIY backyard greenhouse should be. Ideally, anywhere between , 80-85°F (26-29°C) is the golden standardthroughout the spring and summer months.Anything higher than 90°F (32°C) is cause for alarm.

We suggest monitoring your greenhouse temperatures with a good thermometer. However, if you don’t have one – walk inside your greenhouse and see how it feels.

If it’s too hot for you, it’s most likely too hot for your plants as well.

We know this tip may seem obvious, but it is the most important. Consistent watering is crucial for your plants to flourish and keep your greenhouse temperatures down..

How does this work? Whenever you water your plants, they’ll release moisture through their leaves and, in turn, lower the inside temperature. This process of transpiration helps keep your garden from wilting and is the easiest way to keep your greenhouse cool on sweltering summer days.

We all forget to water our plants now and then, so having reminders set up on your phone or an automatic watering system will ensure your garden gets the hydration it needs.

Ventilation windows are a great way to bring in a fresh breeze from outside and allow the hot air to escape, giving your plants a break from a hot and stuffy enclosed space.

The number of windows you should install depends on the size of the greenhouse kit, the climate you’re located in, and the plants you’re hoping to grow.

The main takeaway is to have enough areas for the heat to get out. However, as an example, the following numbers tend to work well for our Sungrow models:

Are you looking for a low-effort ventilation solution?

Try installing heat-activated automatic windows. They’ll open up when the inside temperature rises to a certain point and close once the day cools down. Not to mention, they’re especially handy if you don’t have time to monitor your greenhouse temperature all day.

When it comes to air circulation, a good-quality fan or cooler is your best friend. However, while a fan on its own may struggle to dramatically lower your inside temperature, it will work most effectively alongside ventilation windows and watering.

There are countless benefits to having added airflow in your greenhouse. A fan will help:

A little bit of shade can go a long way to protect your garden from extreme heat. Shade cloths are a handy tool for lowering greenhouse temperatures and filtering out excess UV rays.

Heavy-duty shade netting tends to be made from durable polyethylene. While you can find them with varying shade levels, we recommend opting for a 50% density so your plants can still get enough sunshine to flourish.

You can easily install your shade cloth over the roof of your greenhouse. However, if you need a less permanent solution, try hanging your shade cloth directly over your garden beds or attaching it from a wire inside the greenhouse. That way, it can be unclipped and rolled away on cloudier days.

For gardeners living in cooler climates, high greenhouse heat levels may seem like a solution to many growing challenges. But the reality is, there can be too much of a good thing.

Your greenhouse is an incredible tool to promote healthy plant growth and extend your growing season well beyond summer. However, it takes regular monitoring and a human touch for your garden to thrive in any environment.

Whether you’re preparing for a new season or troubleshooting the challenges of an overheating greenhouse, these 5 tips will help you ensure your plants flourish this summer.

So what are you waiting for? Plantaoffers Backyard Greenhouse Kits in British Columbia and all the way to Ontario.Regardless of your climate, we'll find the perfect solution for you.

Have any questions? Don’t hesitate to leave a comment below, and one of our greenhouse experts will get back to you shortly.