10 Best Portable Greenhouse Heaters 2025 in the United States

The Dr Infrared Heater DR-268 is a solid choice for those seeking a portable greenhouse heater. With its heating capacity of up to 1500W, it effectively warms areas of 150-200 square feet, making it suitable for greenhouses, garages, and sheds. One of its standout features is the built-in digital thermostat, which allows for precise temperature control, ensuring that your plants stay at the right temperature without wasting energy. User-friendly features like the digital display and selectable Auto or Manual modes also make operation straightforward, even for those who aren't tech-savvy.

Safety is a priority with this heater, as it includes features like overheat protection and is designed to be water-resistant (rated IPX5), allowing it to be used both indoors and outdoors without worrying about damage from moisture. Its construction from dual layers of aluminum helps retain heat effectively, making it especially useful in colder environments.

There are some considerations to keep in mind. The heater requires assembly and, while it has multiple mounting options, it may not be as easy to reposition once installed. Additionally, while it’s energy efficient, being electric means it will add to your electricity bill, especially with continuous use. Lastly, with a one-year limited warranty and USA-based customer support, users can feel secure about their purchase. This heater is particularly suited for gardeners and growers looking for a reliable, versatile heating solution that can easily adapt to different spaces and conditions.

The Buyplus Greenhouse Heater is a practical choice if you need to keep a small to medium greenhouse warm, covering about 215 square feet with its 1500W power. It heats up quickly—in just a few seconds—so your plants get warmth almost immediately. The built-in digital thermostat lets you set and maintain temperatures between 40℉ and 108℉, which helps create a stable environment for plants. Safety is well handled with an overheat protection feature that automatically shuts off the heater if it gets too hot, giving peace of mind during use.

Portability is a strong point here: it’s lightweight (around 9 pounds), has a handle for easy moving, and a long 7.5-foot power cord, so you can place it where it’s most needed. The heater also offers two modes—full heating or just a fan—for year-round use, which adds versatility beyond just keeping plants warm. Being electric, it’s easy to power up indoors or outdoors, but keep in mind it needs an outlet.

On the downside, while 1500W is sufficient for smaller spaces, it may struggle in larger greenhouses or extremely cold environments. The energy efficiency isn’t specifically highlighted, so it might use a fair amount of electricity when running at full power. Also, the size and dish shape mean it’s best placed on the floor or a stable surface, not mounted. If you need a straightforward, portable heater with reliable temperature control and safety for protecting plants in a small greenhouse or similar spaces like patios or garages, this Buyplus model is a solid option to consider.

The TRUSTECH Greenhouse Heater is a compact electric heater ideal for small indoor spaces like greenhouses, grow tents, garages, or patios up to about 160 square feet. It offers a decent heating capacity of 1500 watts with three modes: low heat (750W), high heat (1500W), and fan-only, allowing you to adjust warmth as needed. The digital thermostat with a waterproof sensor probe stands out by letting you precisely set temperatures from 40°F to 108°F, which helps maintain a stable environment for plants or comfort in a workspace.

Safety is well-covered with flame-retardant materials, overheat protection, and a reliable thermostat controller, so you can run it safely without constant supervision. Energy efficiency is supported through automatic thermostat regulation that switches the heater on and off to save power while keeping temperature steady, which is useful for reducing electricity bills. Portability is another strong point—the heater weighs just under 5 pounds, includes a sturdy handle, a non-slip base, and a long 7.5-foot power cord, making it easy to move and place where needed.

A minor downside is that it's designed primarily for indoor use and smaller spaces, so it might not be sufficient for larger greenhouses or outdoor areas. Also, being electric, it requires access to a power outlet, limiting where it can be used. This heater is well suited for gardeners or hobbyists looking for an easy-to-use, safe, and efficient way to maintain warmth in smaller indoor plant environments or personal spaces.