Written by a Zeus Services Certified Technician
Bed bug heat treatment is one of the most technically demanding pest control procedures. Our technicians are trained and certified specifically in thermal remediation methodology.
About Bed Bugs
Cimex lectularius — the common bed bug — is a 4–5mm oval, reddish-brown insect that feeds exclusively on blood. They are not a sign of uncleanliness; they hitchhike into properties on luggage, second-hand furniture, clothing and even visitor bags. London's high density housing and international travel patterns make it one of the most affected cities in Europe.
The 7 Signs
Small Blood Spots on Bedding
After feeding, bed bugs often get crushed as you move in your sleep, leaving tiny dark red or rust-coloured blood spots on sheets, pillowcases and mattress fabric. These spots are approximately 1–3mm and may appear in clusters or smeared lines.
Bites in a Line or Cluster
Bed bug bites typically appear in a distinctive straight line or tight cluster of 3–5 bites — sometimes described as 'breakfast, lunch and dinner'. They are most commonly on exposed skin: arms, shoulders, neck and face. Bites are not felt during feeding but become red, raised and intensely itchy 6–24 hours later.
Sweet, Musty Odour
A large bed bug infestation produces a distinctive sweet, musty, slightly sickly odour — sometimes described as overripe raspberries or coriander. This comes from the pheromones they release. If you notice an unexplained sweet smell near your bed or bedroom furniture, investigate immediately.
Dark Faecal Spots
Bed bugs digest their blood meals and leave behind dark brown-black faecal spots approximately 1mm in diameter. These are found along mattress seams, in the joints of bed frames, behind headboards, along skirting boards and inside electrical sockets near the bed.
Shed Skins (Exuviae)
Bed bugs moult five times during development, leaving behind pale yellow translucent shed skins. Finding shed skins in mattress seams, behind headboards or in furniture joints is definitive evidence of an established infestation — nymphs (juveniles) are present and developing.
Live or Dead Bed Bugs
Adult bed bugs are 4–5mm, oval and reddish-brown — roughly the size and colour of an apple pip. After feeding they become engorged and elongated. They are most active between 2am and 5am and will retreat into cracks and seams at dawn. Use a torch to inspect mattress seams, bed frame joints, headboard fixings and bedside furniture.
White Oval Eggs
Bed bug eggs are approximately 1mm long, pearl-white and sticky — glued to surfaces in clusters near harbourage areas. A female lays 1–5 eggs per day. Finding eggs in mattress seams or furniture joints indicates an actively reproducing infestation that will grow rapidly without professional treatment.
What to Do Immediately
Speed matters with bed bugs. Every day without action allows the population to grow and spread to other rooms. Follow these steps as soon as you suspect an infestation:
Do not move your mattress or furniture
This is the most common mistake people make. Moving items spreads bed bugs into new rooms and makes treatment far more difficult and costly. Keep everything in place until a professional has assessed the situation.
Strip and bag all bedding immediately
Remove all sheets, pillowcases, duvets and mattress protectors and seal them inside black bin bags. Take those bags directly to your washing machine — do not carry loose bedding through the property. Wash on the highest temperature the fabric allows (60°C minimum) and tumble dry on high heat for at least 30 minutes.
Vacuum the mattress, bed frame and surrounding floor
Vacuum all mattress seams, the bed frame, headboard, skirting boards and the floor around the bed thoroughly. Immediately after vacuuming, seal the vacuum bag in a plastic bag and place it in an outdoor bin. Do not empty a bagless vacuum inside the property.
Avoid sleeping in another room
It feels instinctive to move to the sofa or a guest room, but bed bugs follow their food source — you. Sleeping elsewhere causes them to spread throughout the property, turning a single-room problem into a whole-house infestation.
Call a professional immediately
Bed bugs cannot be fully eliminated with over-the-counter sprays. Professional heat treatment raises the temperature of the entire room to 56°C — the thermal death point for all life stages including eggs — eliminating them completely in a single visit. The sooner you act, the smaller and more manageable the infestation will be.