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 Mr. Heater Portable Buddy Heater MH9BX is a solid choice for those needing a portable heater for various environments such as workshops, patios, or even camping. With a heating capacity of 4,000 to 9,000 BTUs, it effectively warms spaces up to 225 square feet, which makes it well-suited for small to medium areas. One of its standout features is its advanced infrared technology, providing a cozy, sun-like warmth by directly heating objects and people rather than the air around them.

Safety is a top priority with this heater, as it includes a reliable tip-over safety switch that activates if the unit is disturbed, ensuring that it shuts off if it falls. Additionally, the low-oxygen safety shut-off system adds an extra layer of security for indoor use. The Piezo igniter allows for easy and quick starts, making it user-friendly without the need for matches or batteries.

In terms of energy efficiency, the heater is quite economical, offering up to six hours of warmth on the low setting. This is a big plus for those looking to save on fuel costs while still enjoying reliable heat. Furthermore, its portability is enhanced by a fold-down handle and the ability to connect to both 1 lb. and 20 lb. propane tanks, adding flexibility for different heating needs. While it excels in many areas, the heater is designed for spaces of up to 225 sq. ft., which may limit its use in larger areas. Additionally, being a propane heater, it requires careful handling and ventilation to ensure safety when used indoors.

The Dr Infrared Heater DR-338 Carbon Infrared Patio Heater is a versatile option for those needing a portable greenhouse heater. Its heating capacity ranges from 900W to 1500W, providing instant infrared heat that is both clean and odorless. This makes it suitable for various environments, including greenhouses. The presence of an adjustable thermostat would have been ideal, but it's absent, which means temperature control is limited to the three power settings.

Safety is a strong point with this heater, featuring tip-over protection that automatically shuts the unit off if tilted over 60 degrees. This is crucial for preventing accidents in a greenhouse setting. Additionally, it includes overheat protection, adding an extra layer of safety. The heater's energy efficiency is commendable, given the instant infrared heat it provides, but users should be mindful of the power settings to manage energy consumption effectively.

Portability is another strong aspect, thanks to the included adjustable aluminum tripod and the option for wall mounting. However, the need to plug into a GFCI outlet for outdoor use may limit its portability somewhat, depending on the availability of such outlets. The power source is standard electricity, which is convenient but may not be as cost-effective as other energy sources in the long run. This heater is a strong contender for greenhouse use, particularly due to its safety features and portability, but lacks a bit in temperature control and long-term energy efficiency.