Sun Frost

What Sun Frost does

Sun Frost is a privately held manufacturer of high-efficiency domestic refrigerators and freezers, founded in 1986 by Northern California solar pioneers and led by owner Larry Schlussler PhD. The company is headquartered in Arcata, California, with products deployed in over 50 countries. Its core technology centers on top-mounted cooling system architecture, passive condenser designs (no fans), 4-6 inches of polyurethane foam insulation, and dual compressor load-shedding logic that cuts refrigeration energy consumption by approximately 5x versus conventional units. The product portfolio spans residential refrigerator-freezer combinations (RF19, RF16, RF12, RF10, RF4 and their variants), vaccine storage units (RFVB, F1 Direct Drive), and complementary sustainable living products including composters, composting toilets, and heliodons. Models are available in 12V, 24V, 48V DC and 110V/220V AC configurations, priced between $1,795 and $3,640.

The company monetized through direct hardware sales from its Arcata factory and via institutional procurement channels, notably UNICEF and WHO programs for vaccine cold chain applications. The RFVB vaccine refrigerator holds WHO Performance, Quality and Safety approval, and the company is an approved UNICEF System Supplier. As of 2024, Sun Frost has exited refrigerator manufacturing and restructured around consulting, parts support for the installed base, and R&D on more efficient cooking methods targeted at the developing world. The firm employs 11-50 people and reports no institutional investors, external funding rounds, or M&A activity.

Name

Sun Frost

Legal name

Sun Frost

Website

https://sunfrost.com

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

11–50 employees

Short description

Sun Frost is a privately held Arcata, California-based designer of high-efficiency DC and AC refrigerators, freezers, and vaccine storage units, deployed in 50+ countries. As of 2024, the company has exited manufacturing and now focuses on consulting, parts, and clean cooking R&D.

Ownership category

akta.pro rank

Product category

Energy-Efficient Domestic Refrigeration

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Home and Garden Equipment Repair and Maintenance (811411)

SIC

Household Appliances (3630)

akta.pro primary industry

Chillers & Cooling Plant Equipment (IMAHAKAE)

Keywords

• Energy-efficient refrigerators
• DC-powered refrigeration
• Vaccine cold chain storage
• Off-grid solar freezers
• Composting toilets

Headquarters

HQ city

Arcata

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D

Revenue model

1. Refrigerator and Freezer Sales: Sun Frost manufactures and sells high-efficiency refrigerators and freezers available in DC (12, 24, 48V) and AC (110, 220V) configurations. Products include residential models (RF19, RF16, RF12, R10, F10, RF4, R4, F4) and vaccine storage units (RFVB).
2. Composting Products: Sale of Scrap Eater home composters and Human Humus Machine composting toilets for sustainable living.
3. Heliodons: Sale of educational heliodon devices (MLS and TT models) that simulate sun movement throughout the year.
4. Consulting Services: Since no longer manufacturing refrigerators, the company provides consulting services and parts for their products.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Sun Frost manufactures highly energy-efficient DC and AC domestic refrigerators, freezers, and vaccine storage units designed for residential, off-grid, marine, and health-program use in remote locations. Beyond refrigeration, the company offers composting toilets, household composters, and educational heliodons, while increasingly providing consulting services and replacement parts for installed legacy units.

Product overview

Sun Frost is a manufacturer of high-efficiency refrigerators and freezers for energy-conscious consumers, with a product portfolio organized around three tiers of residential refrigerator-freezer units (RF19, RF16, RF12, RF10, RF4 series), vaccine storage units (RFVB, F1 Direct Drive), and complementary sustainable living products (Scrap Eater composter, Human Humus Machine and CS composting toilets, Heliodons). All refrigerator and freezer models are available in 12V, 24V, 48V DC or 110V/220V AC configurations. The company is no longer manufacturing refrigerators but continues consulting and providing parts. The current product line centers on domestic and DC vaccine refrigerators used in over 50 countries, supplemented by composters and composting toilets for sustainable living.

Differentiator

Problem solved

Functional benefit

Products and services

• RF19 Refrigerator/Freezer 19-cubic-foot combination refrigerator and freezer designed for off-grid, solar, and AC-powered households requiring efficient cold storage.
• R19 Refrigerator 19-cubic-foot refrigerator-only configuration for energy-efficient household cooling.
• F19 Freezer 19-cubic-foot standalone freezer for off-grid and low-energy homes.
• RF16 Refrigerator/Freezer 16-cubic-foot combination refrigerator and freezer for smaller households needing both cooled and frozen storage.
• RF12 Refrigerator/Freezer 12-cubic-foot combination refrigerator and freezer for compact off-grid or marine installations.
• R10 Refrigerator 10-cubic-foot refrigerator-only model designed for small off-grid homes and marine/RV use.
• F10 Freezer 10-cubic-foot standalone freezer for compact solar/off-grid installations and remote properties.
• RF4 Refrigerator with Ice Tray Smallest combination refrigerator/freezer with ice tray, intended for very low-energy settings including tiny homes and remote cabins.
• R4 Refrigerator 4-cubic-foot compact refrigerator for boats, RVs, and tiny off-grid spaces.
• F4 Freezer 4-cubic-foot compact freezer designed for marine, RV, and cabin applications.
• RFVB Vaccine Storage Refrigerator/Freezer Dual-compressor vaccine storage unit with load shedding, used by remote health clinics and immunization programs for cold-chain reliability on intermittent power.
• F1 Direct Drive Freezer Battery-free direct-drive freezer that operates directly from solar PV without battery banks, targeted at vaccine and food freezing in low-resource settings.
• Scrap Eater Composter Residential food-waste composter that turns kitchen scraps into compost for household gardens.
• Human Humus Machine Composting Toilet Dry composting toilet designed for off-grid homes, cabins, and properties lacking conventional sewer connections.
• Sun Frost CS Composting Toilet Clivus-style composting toilet sold by Sun Frost for waterless waste handling in remote residences.
• MLS Heliodon Multi-light-source heliodon used by architecture schools, designers, and educators to study daylight behaviour on building models.
• TT Heliodon Track-mounted heliodon for educational sunlight simulation in architectural and solar-design coursework.
• Sun Frost Replacement Parts Service Direct-supplied replacement parts and repair support for legacy Sun Frost refrigeration units in service worldwide.
• Sun Frost Consulting Services Technical consulting on efficient refrigeration, cooking methods for the developing world, and related sustainability engineering, offered by Sun Frost's engineering team.

Quantifiable outcome

• RF16 consumes only 15 KWh/month vs 75 KWh for average refrigerator, reducing solar system cost from $4,500 to $500
• +3 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Four partnerships are on record, tiered core and minor.

• UNICEFcoreChannel Partner/ Reseller/ DistributorSun Frost is an approved UNICEF system supplier for vaccine storage refrigerators. UNICEF procures Sun Frost vaccine refrigerators for distribution to developing countries without reliable grid power.
• World Health Organization (WHO)coreChannel Partner/ Reseller/ DistributorSun Frost RFVB vaccine refrigerator has received WHO PIS (Performance, Quality and Safety) approval, enabling procurement through WHO programs for international health initiatives.
• WHO-PATHcoreStrategic or Co-development PartnerSun Frost RFVB-134a was chosen by WHO-PATH team for collaborative study on Long Life Batteries for cold chain refrigeration in Vietnam. Refrigerator performance was monitored for several months with ambient temperatures ranging from 8°C to 32°C.
• SELF (Solar Electric Light Fund)minorStrategic or Co-development PartnerSELF tested the Sun Frost F1 Direct Drive freezer in Colombia for 2 years. Funding was provided through a grant from the Bill & Melinda Gates Foundation.

Scale indicators7 records

Recent moves5 records

Expansion highlights4 records

Emerging players

• Haier Biomedical: Haier Biomedical manufactures WHO-prequalified vaccine cold chain equipment including solar direct-drive refrigerators, and has rapidly scaled into global health procurement. They compete directly with Sun Frost in UNICEF and ministry of health tenders at much larger scale.

Broad incumbents

• Sub-Zero Group: Sub-Zero manufactures high-end residential refrigeration with emphasis on food preservation quality and durability, similar to Sun Frost's premium positioning. While not focused on off-grid DC use, they share the ultra-premium consumer niche.
• Whirlpool Corporation: Whirlpool is a global household appliance manufacturer with ENERGY STAR-rated refrigerators at mainstream price points. As mainstream efficiency improves, Whirlpool and similar incumbents increasingly encroach on the entry-level residential efficiency segment where Sun Frost once held a premium position.
• True Manufacturing: True Manufacturing is a major U.S. manufacturer of commercial refrigeration equipment. While much larger and focused on commercial kitchens and foodservice, their commercial refrigeration portfolio overlaps with Sun Frost's vaccine and specialty cold storage business.

Direct peers

• Norcold: Norcold specializes in absorption and compressor refrigerators for RVs and trucks, competing with Sun Frost's small-format RF4, R4, and F4 models in the RV and marine market, particularly where DC power and energy efficiency matter.
• Dometic: Dometic manufactures DC-powered refrigerators and freezers for marine, RV, and off-grid applications, directly competing with Sun Frost in the mobile and off-grid residential segments. Both companies serve similar customer use cases around battery-powered and solar-compatible cooling.
• B Medical Systems: B Medical Systems is a leading manufacturer of vaccine cold chain equipment, including WHO-prequalified solar direct-drive refrigerators that compete directly with Sun Frost's RFVB and F1 Direct Drive in UNICEF and Gavi-funded procurements.
• SunDanzer: SunDanzer (now part of Haier Biomedical) manufactures solar-powered DC refrigerators and freezers for vaccine storage and off-grid residential use, with WHO-prequalified products that directly overlap with Sun Frost's RFVB and F1 Direct Drive offerings.
• Vestfrost Solutions: Vestfrost Solutions manufactures solar-powered and mains-powered vaccine refrigerators that are WHO-prequalified and supplied through UNICEF channels, competing directly with Sun Frost in the humanitarian vaccine cold chain market.
• Engel Coolers: Engel manufactures portable and built-in DC-powered refrigeration for marine, RV, trucking, and off-grid applications. Their compressor-based coolers compete with Sun Frost's smaller DC units in the mobile and energy-conscious consumer segment.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/100063771541469
• LinkedInlinkedin.com/company/sun-frost

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sun Frost