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Both thermal and cold (ULV) fogging machines have a place — but the wrong choice wastes insecticide and frustrates field teams. Here's the side-by-side comparison we walk every buyer through.
Start with the question
Thermal fogging wins. Dense visible cloud penetrates vegetation, drains, and structures where Aedes and Culex rest.
Cold (ULV) fogging wins. No heat, no visible cloud, lower chemical drift — ideal for hospitals, food-handling areas, server rooms.
Either can work — thermal for open fields and orchards, cold for greenhouses and chemical-sensitive crops.
Side-by-side
| Thermal Fogging | Cold (ULV) Fogging | |
|---|---|---|
| Droplet size | ~10–25 μm (warm fog) | ~5–50 μm (cold mist) |
| Visible cloud | Yes, dense | Minimal / invisible |
| Heat | Hot (uses pulse-jet) | Cold (mechanical pressure) |
| Indoor use | Not recommended (heat + visibility) | Yes — preferred |
| Outdoor mosquito control | Preferred (dense cloud penetrates) | Possible but less effective |
| Insecticide carrier | Oil-based | Water-based or oil-based |
| Per-hour coverage | High (esp. vehicle-mounted) | Moderate |
| Operator skill | Higher (heat safety) | Lower |
| Typical use case | Municipal vector control, parks, drains | Hospital / school / warehouse disinfection |
| 100x Circle model | DB400 (vehicle-mounted) / SSMA20 | TFS50 (supports both modes) |
Most municipal vector-control programmes deploy both — thermal for outdoor ward drives, cold for institutional disinfection. The TFS50 supports both modes in a single unit.
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View detailsTell our team the use case, area, and frequency — we'll recommend the right form factor and quote indicative pricing.
Frequently asked questions
The thermal & cold combo unit (100XTFS50) — it supports both thermal and cold (ULV) modes in a single machine. For most buyers who need flexibility across outdoor mosquito control and indoor disinfection, this is the most versatile single-machine choice.
Yes. Cold fogging produces no heat and a minimal visible cloud, so it's appropriate for occupied or sensitive indoor environments — hospitals, schools, server rooms, food-handling areas. Thermal fogging is generally restricted to outdoor or empty-area use because of the heat and visibility.
Both can use CIB-approved adulticides, but thermal foggers typically need an oil-based carrier (for clean vaporisation), while cold foggers work with either oil- or water-based carriers. We provide dilution guidance with every machine.
Thermal fogging suits open fields and orchards (better penetration through canopy). Cold fogging suits greenhouses and chemical-sensitive crops where heat or visible drift is undesirable. Many large farms run both for different blocks.
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