A 34-Room Beach Resort With 61 Reviews Mentioning Mosquitoes in One Season and a Tour Operator That Walked
Last updated: 7 Sep 2026 | 8 Views |
A resort that sells the outdoors, where guests cannot sit outdoors
A 34-Room Beach Resort With 61 Reviews Mentioning Mosquitoes in One Season — and a Tour Operator That Walked
Why monthly contracted spraying is not enough, and why a resort should own its own fogger
Guests give five stars for the view, five for the food, five for the staff — then three overall, because of one sentence: far too many mosquitoes, we could not eat outside.
Khun Nathee is 43 and owns a 34-room beach resort in Khao Lak, Phang Nga. The property's selling points are a large tropical garden, a poolside sala, and an open-air restaurant looking out to the sea.
In 2025 he invested more than 2.8 million baht upgrading the garden and outdoor areas — adding a water feature, planting mature trees and rebuilding the poolside deck — to raise the guest experience.
That season, reviews mentioning mosquitoes rose to 61 out of 240 reviews. The average score fell from 8.8 to 7.9, and a tour operator sending 12 groups a year gave notice that it would not renew for the following season.
The one sentence that followed every compliment
What confused him, Khun Nathee says, is that the reviews were not angry. Guests praised the view, the food and the staff. Many said they would return — and then added a final line about mosquitoes.
When his team counted, reviews containing the word mosquito averaged 7.1, while reviews without it averaged 9.2. That is a gap of more than two full points from a single factor.
Worse, 43 of the 61 mosquito reviews named the same location: the open-air restaurant at dinner — the exact area he had just spent the most money improving.
He had spent nearly three million baht building the most beautiful space on the property, and guests were able to sit in it for less than twenty minutes per meal.
Why monthly contracted spraying is not enough
The resort already paid a pest control company to spray once a month, at 6,500 baht per visit, which Khun Nathee assumed was sufficient because it was the frequency the company recommended.
When he consulted an entomologist, a friend of his brother's, the answer explained everything at once: Aedes and Culex mosquitoes complete their egg-to-adult cycle in just 7 to 10 days.
Monthly spraying therefore knocks the population down in week one, lets it recover fully by week two, and leaves it high through weeks three and four until the next visit.
Put plainly, the resort was paying nearly eighty thousand baht a year to have fewer mosquitoes for one week in every four — which does not match a business where guests check in every single day, not only in the first week of the month.
What the resort tried that did not work
The first move was to give every room a can of repellent, at about 14,000 baht a month. It helped a little, and it led several guests to write that the resort itself was admitting there was a mosquito problem.
Next came twelve electric insect-killing lamps around the outdoor areas, at about 96,000 baht. Plenty of insects died in them — but mostly other night-flying species, because Aedes mosquitoes are not primarily drawn to light.
They also tried citronella candles on every table at dinner. These work within a very narrow radius, fail entirely on a breezy night, and the smoke interfered with the food, as several guests noted.
The turning point came when the maintenance manager, who had previously worked for a municipality, suggested that if the resort owned a thermal fogger, they could fog every evening before the restaurant opened rather than waiting for a contractor's schedule.
What changed once they fogged for themselves
The resort bought one AIROFOG AT35 thermal fogger and sent two maintenance staff for training on operation and correct chemical mixing ratios.
The new routine was to fog every evening at about half past five, ninety minutes before the open-air restaurant opened, concentrating on shrubs, under the deck, the water feature edges and the boundary hedge — the resting sites of adult mosquitoes.
For the first three weeks Khun Nathee had staff count guests leaving their table mid-meal. The number fell from an average of 9 tables a night to 1.
In the following season, reviews mentioning mosquitoes fell from 61 to 7, the average score returned to 8.9, and the tour operator that had given notice signed again — and increased to 15 groups a year.
What it actually costs
One word in a review costs more than two full points
Reviews containing the word mosquito averaged 7.1; those without it averaged 9.2. A 2.1-point gap from a single factor is more than enough to change your ranking on every booking platform.
The space you invested in most is the space guests cannot use
The resort spent 2.8 million baht on the garden and outdoor areas, yet 43 of the 61 mosquito reviews named the open-air restaurant at dinner. The largest investment produced the least value.
Tour groups are large revenue that leaves in one piece
A single operator sending 12 groups a year is worth millions of baht annually, and when they leave they do not cancel a night at a time — they cancel a season. Replacing a corporate account takes a year.
A disease risk the tourism business cannot absorb
If a guest contracts dengue or chikungunya and it is traced back to the resort, the consequences run past reviews into insurance, tour operator relationships, and in some cases public health inspection.
Why the usual fixes do not work
Contracting an external company to spray monthly
Mosquitoes complete their cycle in 7 to 10 days, so monthly spraying suppresses the population for one week and lets it return for the other three — while guests arrive every day.
Giving every room a can of repellent
It helps individuals, but it sends the opposite signal to the one you want: a number of guests read it as the resort admitting a mosquito problem, and wrote about it in their reviews.
Installing electric insect-killing lamps
They do attract night-flying insects and kill plenty of them. But Aedes mosquitoes, the actual problem, are not primarily drawn to light — so it is an investment that kills the wrong species.
Citronella candles on every table
Effective within a very narrow radius and useless on a breezy night, which is the normal condition at a beach resort — and the smoke interferes with the meal, as guests noted.
Mowing and clearing more often
Necessary and worth continuing, because it reduces resting sites and standing water. But it does not kill the adult mosquitoes already flying — the ones biting guests at dinner tonight.
If mosquitoes come back every week, fogging has to be possible every week
What Khun Nathee understood after speaking to the entomologist is that the problem was never the quality of the spraying. It was the frequency — and the right frequency is impossible if you have to wait for an external provider's schedule every time.
Costed out, weekly contracted spraying all year comes to roughly 338,000 baht a year — several times the price of a good thermal fogger, and the resort would still be fogging on somebody else's timetable.
The AIROFOG AT35 answers this directly. It is a shoulder-carried machine with a 100 percent stainless steel body, which resists both coastal salt air and chemical corrosion. It is light enough for one member of staff to cover the grounds in under an hour. It runs both water-based and oil-based chemicals, is certified in Germany and the UK, and is supported by a service centre with genuine parts in Thailand — so the resort fogs every evening before the restaurant opens, without waiting for anyone.
10 reasons the AIROFOG AT35 thermal fogger solves it
1. Fog on your own schedule, every day if needed
Owning the machine means fogging on your business rhythm — every evening before the restaurant opens — which is a frequency that matches the mosquito's actual life cycle rather than a contractor's route plan.
2. 100 percent stainless steel body resists coastal salt air
A beachfront property corrodes equipment far faster than normal, from both salt air and the chemicals in use. An all-stainless body is the material that suits these conditions directly.
3. Thermal fog penetrates shrubs and the space under decking
Adult mosquitoes rest in shrubs, under decking, around water features and along boundary hedges — places coarse spray never reaches. Very fine thermal fog is the format best suited to garden environments.
4. Runs both water-based and oil-based chemicals
The resort can choose the formulation to suit the weather and the insect, without buying two machines and without risking damage from using the wrong product in a single-format machine.
5. Light enough for one person to cover the grounds
Resort fogging means walking the garden, the pool surround and the boundary continuously. Machine weight determines whether one staff member covers everything in one pass — which is what makes the routine sustainable.
6. Far cheaper than high-frequency contracted spraying
Weekly contracted spraying runs to several hundred thousand baht a year. A quality fogger is a one-off cost, plus chemicals bought directly at a far lower cost per round.
7. Certified in Germany and the UK
For a hotel business that has to answer tour operators and insurers, verifiable certification is entirely different from saying that you spray for mosquitoes regularly.
8. Service centre and genuine parts inside Thailand
Equipment that cannot be repaired locally is equipment that will stop working in high season and sit for a month. A local service centre with genuine parts and technicians of over 10 years' experience brings it back in days.
9. Useful for disinfection of common areas too
Beyond mosquitoes, a thermal fogger is used to disinfect common areas, storerooms and back-of-house spaces — so one piece of equipment serves several maintenance needs.
10. Something to put on your listing and in review replies
Stating that the resort fogs for mosquitoes every evening before the restaurant opens is a concrete answer to older mosquito reviews, and a point almost no competing property is making.
Before the thermal fogger
- 61 of 240 reviews in one season mentioning mosquitoes
- Average score falling from 8.8 to 7.9
- A tour operator sending 12 groups a year giving notice for the following season
- An average of 9 tables a night leaving mid-meal
- 2.8 million baht invested in outdoor areas guests could use for under 20 minutes a meal
- 6,500 baht a month for contracted spraying that suppressed mosquitoes for one week in four
After the thermal fogger
- Reviews mentioning mosquitoes down from 61 to 7 the following season
- Average score back to 8.9
- Tables leaving mid-meal down from 9 a night to 1
- The tour operator signing again and increasing to 15 groups a year
- Fogging done in-house every evening, in under an hour per round
- A line on the listing stating the resort fogs for mosquitoes every evening
The three-step process
1. Survey the grounds and set the fogging route
Walk the property to find adult resting sites — shrubs, under decking, water feature edges, boundary hedges and still corners — then set a route that covers every one of them in a single pass.
2. Prepare the machine and mix the chemical
Check the machine before use, mix to the ratio specified by the manufacturer and the Department of Disease Control, choose water- or oil-based to suit the weather, and give staff and guests advance notice of the fogging time.
3. Fog, then flush the machine
Fog in the evening at least an hour before the outdoor areas open, when the air is calm and mosquitoes begin to feed. Then flush the system and clean the machine every time, so no chemical remains to corrode it.
From someone who uses one
I spent almost three million baht on the garden and outdoor areas, and guests could sit there for under twenty minutes because of mosquitoes. At first I blamed the spraying company. Then someone explained that a mosquito's life cycle is seven to ten days, so monthly spraying can never be enough. Once we bought a machine and fogged every evening, the mosquito reviews almost disappeared in a single season — and the tour operator that had left came back.
Khun Nathee W. — owner, 34-room beach resort, Khao Lak, Phang Nga
Why resorts and garden hotels are the environments mosquitoes prefer
What makes a resort beautiful is exactly what makes it comfortable for mosquitoes. Dense shrubs give shade and humidity. Ponds and water features raise the humidity of the air. Planters and their saucers hold the small volumes of water needed for egg laying.
Aedes lay eggs in remarkably small volumes of standing water — a bottle cap is enough. In a resort with hundreds of planters, saucers, drainage channels and water-holding leaf axils, the number of breeding sites exceeds what any team can clear daily.
Adult mosquitoes also need daytime resting sites: shaded, wind-free shrubs, the space under decking and salas, and boundary hedges with climbing plants. This is why larval control alone is never enough.
Thermal fogging is therefore the tool that matches the problem most closely, because very fine droplets drift into the shrubs and corners where adults rest — places other spray formats cannot reach.
The arithmetic of buying versus contracting
Suppose the resort wants a frequency that actually works — at minimum weekly. At 6,500 baht per visit, that is around 338,000 baht a year.
Buying a quality thermal fogger, by contrast, is a one-off cost, plus chemicals bought directly at a far lower cost per round, plus labour from staff you already employ.
More important than the arithmetic is flexibility. With your own machine you can fog on demand: the day of a poolside wedding, the day a large group checks in, or after several days of heavy rain, which is when mosquito numbers rise fastest.
Many resorts WHD works with therefore run a hybrid model: their own machine for the weekly routine, plus an external provider two or three times a year for deeper work such as breeding site elimination and treatment of hard-to-reach areas.
Frequently asked questions
Can we fog while guests are on the property?
Fog only where nobody is present — typically in the evening at least an hour before the restaurant opens, or mid-morning when guests are out. Give guests advance notice so they can close their room windows.
How often should we fog?
At least weekly, so the interval is shorter than the 7 to 10 day mosquito life cycle. Resorts with large gardens and water features usually fog every evening through the rainy season and twice a week in the dry season.
Can ordinary staff operate the machine?
Yes. The AT35 is straightforward to use, and the WHD team provides operating and chemical mixing training on delivery, along with guidance on personal protective equipment for operators.
Will it stand up to a coastal environment?
The AT35 is built from 100 percent stainless steel, which suits salt air and high humidity. Flush and wipe the machine after every use to get the longest possible service life.
What chemicals can we use?
Both water-based and oil-based registered products. Our team can advise on the type and ratio best suited to a resort's outdoor areas and to the species you are seeing.
Does it replace larval control?
No — the two go together. Thermal fogging kills flying adults; removing standing water and treating containers cuts off breeding. You need both for real control.
What after-sales support is there?
WHD runs a thermal fogger service centre with 100 percent genuine model-specific parts and technicians with over 10 years' experience, and always diagnoses and quotes before repairing.
How do we order or get a quotation?
Call 065-556-6294 or add LINE @whd268. Our team will recommend the right model for your area, prepare a quotation, and advise on chemicals and operator training.
Guests give you five stars for everything, then deduct for something you could fog away in an hour
If your reviews praise the view, the food and the staff and then end with the word mosquitoes, the problem is not the quality of the spraying. It is the frequency — and an effective frequency is impossible while you wait on an external provider's route.
The AIROFOG AT35 thermal fogger has a 100 percent stainless steel body that stands up to coastal salt air, is light to carry, runs both water-based and oil-based chemicals, is certified in Germany and the UK, and is backed by a service centre with genuine parts in Thailand — so you fog every evening before the restaurant opens.
The WHD team will recommend the right model for the size of your property. Call 065-556-6294 or add LINE @whd268.
Thermal foggers and ULV sprayers for resorts, hotels, restaurants, golf courses, housing estates, factories and government agencies across Thailand
See the machine and pricing — click here
Call 065-556-6294 or add LINE @whd268
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