- (301) 829-0060
- Mt. Airy, MD
- info@pestshieldinc.com
Pest Shield, Inc. (MDA #30263) has provided licensed pest management across Frederick County since 2011, with owner Troy Yowell personally involved in the majority of service calls. Jeffrey Allwine, an on-staff entomologist, supports species-level identification and treatment calibration — a diagnostic capability that matters for bed bug work, where accurate confirmation before treatment is the difference between a resolved case and a wasted visit. Pest Shield carries 338+ five-star reviews across Google and HomeAdvisor and has been recognized as Best of Frederick MD Pest Control (2021) and Best of Nextdoor for four consecutive years.
How it works
Four steps. No surprises. Same answer whether it's your first call or your tenth.
You reach Troy or someone on his team directly. No call center, no dispatcher, no routing.
Same-day or next-day for most calls. Emergency stinging-insect situations and real-estate WDI deadlines get priority.
We identify the species, locate entry points, and find the source — not just the symptom.
Written recommendation, straightforward pricing, no obligation. If you don't need treatment, we'll tell you.
Bed bugs are one of the most misidentified pests in residential pest control. Mosquito bites, flea bites, spider bites, and even contact dermatitis can look nearly identical to bed bug bites on skin alone. Before any treatment is recommended, Pest Shield’s inspection confirms the pest — because treating for the wrong thing wastes time and money you don’t have when you’re already dealing with this.
The signs that point specifically to Cimex lectularius (the common bed bug) rather than another biting insect:
If you’re seeing one or more of these signs, a professional inspection is the right next step — not a preemptive treatment. Bed bugs are distressing in a way most household pests aren’t. The anxiety, the disrupted sleep, the uncertainty about whether you’ve spread them — that’s a real and legitimate response to a genuinely difficult situation. Pest Shield’s inspection is free for new clients and is designed to give you a clear answer before any treatment decision is made.
One additional note: a single treatment rarely closes a bed bug case. Bed bug eggs are resistant to most pesticides, which means any treatment protocol that doesn’t account for the egg hatch cycle — typically 6–10 days — will leave a surviving population behind. This is why professional bed bug treatment is structured as a multi-visit protocol, not a one-time spray.
60+ years of combined experience. Tell us what you’re seeing — we’ll come look, no obligation.
It was a horrible discovery when we realized we had brought bed bugs to our home from a hotel we had stayed in. I called Troy in an absolute panic and he was so kind, patient and helpful. He spent over an hour on the phone with me, educating me all about bed bugs and how to get rid of them. I called back twice more before he came to service our home because I was so upset and he truly helped ease my fears. When he came he was prompt, thorough, and professional. I also greatly appreciated how he scheduled a follow up to make sure the problem was taken care of. We were SO grateful with the new technology and spray Troy uses that was safe for our children and dog, left no smell, and completely eradicated the problem. Troy is honest, extremely kind, unbelievably knowledgeable, priced very fair, and more than capable of handling bug problems. We couldn’t recommend him more!
Alexandra Edwards · January 2023 Read on Google →
We hired Pest Shield despite the fact that their price was more than double some of the other companies I interviewed. The reason we did is because unlike the other companies, Pest Shield uses heat as a treatment. After doing my online research, I decided it was worth the extra money to do so. The first round of heat didn’t completely work – the next day, Troy from Pest Shield and I found live bed bugs in some of the blankets. Troy was true to his word, and reheated the upstairs for free and did additional treatments. It appears this second heat treatment was completely effective.
Marc Shiman · April 2014 Read on HomeAdvisor →
I had bed begs. Troy and his team got rid of them (so far). It has only been a few days but I was very impressed with the professionalism, honesty and expertise he provided to me. His pricing compared to his competitors was great as well! I was so impressed I referred him to my parents for termite treatment before he even did the treatment in my home. I would definitely recommend Troy and Pest Shield to others, and would hire Troy again in a second!
Alison Harris · November 2013 Read on HomeAdvisor →
General pest & rodent control
Pest Shield’s bed bug work begins with a thorough inspection — mattress seams, box springs, bed frames, headboards, baseboards, upholstered furniture, electrical outlets, and any wall voids or flooring gaps where bed bugs establish harborage. Jeffrey Allwine’s entomological background supports species-level identification when field confirmation is needed. Troy confirms the infestation scope and explains exactly what the treatment will involve before any work begins. Customers are not scheduled for treatment based on a phone description alone.
Two treatment methods are available, selected based on the infestation’s severity, location, and the specifics of the home:
| Treatment Method | How It Works | Best For |
|---|---|---|
| Bio-pesticide spray | A newer spray technology applied to harborage sites and surrounding areas. Leaves no odor. Documented safe for children and pets. | Homes with young children, pets, or occupants with chemical sensitivities. Moderate infestations with identifiable harborage. |
| Heat treatment | Raises room temperature to levels lethal to bed bugs and eggs at all life stages. Penetrates wall voids, mattress interiors, and furniture that spray cannot fully reach. | Heavier infestations, older homes with difficult access, cases where spray alone may not reach all harborage sites. |
Pest Shield’s treatment protocol is structured as a bounded multi-visit cycle — typically 2 to 3 visits spaced approximately 2 weeks apart. The spacing is not arbitrary: it’s calibrated to the bed bug egg hatch cycle. Eggs laid before the first treatment survive it, hatch within 6–10 days, and must be treated before they reach reproductive maturity. A second visit at the two-week mark addresses that hatch. A follow-up inspection confirms eradication before the case is closed. “Resolved” means no live activity confirmed on follow-up — not just “we treated it.”
If the first treatment does not fully eliminate the infestation, Pest Shield re-treats at no charge. This is documented: when a heat treatment didn’t completely resolve a bed bug case on the first application, Troy re-heated the space for free and applied additional treatments until the problem was confirmed gone. That commitment is built into how Pest Shield approaches this work — not offered as an upsell or exception.
The bio-pesticide spray option is documented safe for homes with children and pets, leaves no smell, and has been confirmed effective as a complete eradication method. For homes with young children or animals, this is typically the starting point. EPA-approved methods are used throughout. Troy will walk you through what to expect during and after treatment — including any brief period before re-entry — when he confirms your appointment.
Owner
Founded Pest Shield in 2011 after years as a pest management contractor on U.S. military bases in Iraq and Afghanistan. Around 35 years in pest management. Personally handles or leads the majority of service calls.
Pest Management Specialist
Field technician handling residential and commercial service calls across Frederick, Carroll, and Montgomery counties.
Pest Management Specialist
Field technician handling residential and commercial service calls across the service area.
Our Entomologist
Consulting entomologist on species identification, conducive conditions, and treatment strategy for difficult cases.
Emmitsburg sits in the northern corner of Frederick County along US-15, close to the Pennsylvania border and roughly 20 miles north of Frederick. The town is served by Pest Shield’s Frederick County coverage area, and Pest Shield’s same-day and next-day scheduling means Emmitsburg residents aren’t waiting days for a national chain to route a technician from a distant service hub.
Emmitsburg’s older housing stock — including historic properties near Mount St. Mary’s University and the National Shrine — presents the kind of structural complexity that makes bed bug treatment harder: wall voids, wide-plank flooring gaps, and older construction where harborage sites are less predictable. Pest Shield has documented experience treating historic homes with difficult access, and the inspection process accounts for these conditions before a treatment method is selected. For broader pest control in Emmitsburg, the same owner-operated approach applies across every service.
Bed bug treatment typically requires 2 to 3 visits spaced approximately 2 weeks apart. The spacing is driven by biology: bed bug eggs are resistant to pesticide and heat at certain application levels, and they hatch within 6–10 days of being laid. The second visit targets that hatch before the newly emerged nymphs reach reproductive maturity. A follow-up inspection confirms no live activity before the case is closed. One treatment is rarely sufficient to fully resolve an infestation — any protocol that doesn’t account for the egg hatch cycle will leave a surviving population behind.
Yes — Pest Shield’s bio-pesticide spray option is documented safe for children and pets, leaves no odor, and has been confirmed effective as a complete eradication method. For homes with young children or animals, this is typically the starting point. Heat treatment is also an option for cases where it’s the better fit; Troy will walk you through which method makes sense for your situation and what, if any, brief re-entry window applies after treatment.
Troy will give you specific preparation instructions when your appointment is confirmed, since the steps vary depending on which treatment method is being used. In general: do not move mattresses, furniture, or bedding to other rooms before treatment — this is one of the most common ways bed bugs spread to previously unaffected areas of a home. Wash and dry bedding on high heat if instructed, but hold off on any other prep until you have guidance specific to your treatment plan. Pest Shield will tell you exactly what’s needed and what to avoid.
No. If the first treatment doesn’t fully resolve the infestation, Pest Shield re-treats at no charge. This is documented: when a heat treatment didn’t eliminate a bed bug case on the first application, Troy re-heated the space for free and applied additional treatments until the problem was confirmed gone. The follow-up visit to verify eradication is built into the protocol — “resolved” means no live activity confirmed on inspection, not just “we treated it once.”
National chains typically route calls through a dispatch center and schedule based on regional availability — which often means multi-day waits for a rural Frederick County address like Emmitsburg. Pest Shield is owner-operated out of Mt. Airy, covers Frederick County directly, and offers same-day and next-day scheduling for active infestations. When you call, you reach the people who will do the work. Troy is personally involved in the majority of service calls, and the inspection — free for new clients — happens before any treatment is recommended, not after a phone-based upsell. For a pest category where the wrong hire is genuinely costly, that difference matters.
