In Frederick County? We'll get to you within 4 Hours!
In Frederick County?
We'll get to you within 4 Hours!
Available 24/7
Available 24/7
Available 24/7
Don't fall for $0 Service calls
Some companies offer “free” service calls and make their money back by selling you a new system—even when it’s an easy fix. At GSSN, we don’t allow our technicians to upsell a system just to pad the bill. You’ll get an honest diagnosis, every time.
Let our licensed & certified techs diagnose your system for just $100.
Some companies offer “free” service calls and make their money back by selling you a new system—even when it’s an easy fix.
At GSSN, we don’t allow our technicians to upsell a system just to pad the bill. You’ll get an honest diagnosis, every time.
Let our licensed & certified techs diagnose your system for just $100.
Repaired same-day – by local, factory-certified techs who respect your home
Repaired same-day – by local, factory-certified techs who respect your home
Repaired same-day – by local, liecensed techs who respect your home
Comes with a 1-year parts warranty – So we fix it right the first time.
Comes with a 1-year parts warranty – So we fix it right the first time.
Comes with a 1-Year labor & parts warranty – we fix it right the first time.
100% satisfaction guarantee – Only pay when you're 100% happy :)
100% satisfaction guarantee – Only pay when you're 100% happy :)
Ready to make your system work again?
Ready to make your system work again?
Ready to make your system work again?
Just fill this out, and we’ll get back to you ASAP to send a licensed HVAC technician to your home.
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“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
“Angel & Nick were extremely helpful & prompt. Weren’t trying to sell me anything, were sincerely only interested in fixing my problem according to my needs.” Read on Google
Billy Edwards
“Very pleasant experience! They are very knowledgeable and professional. During my appointment they walked me through all code problems and educated me on everything they found. I would definitely recommend!” Read on Google
Brian Bushey
“AC shut down so I put in a request with AHS. Sean showed up on time and fixed the issue quickly. Thankful for the quick fix and information he provided me. Hopefully I can prevent this issue in the future.” Read on Google
Joe McFadden
Everything You Need to Know in One Visit
Everything You Need to Know in One Visit — Covered for 6 Months
When we diagnose your system, we do it right the first time. No second opinions, no repeat visits, no surprise breakdowns a week later.
Here's how we do it:
When we diagnose your system, we do it right the first time. No second opinions, no repeat visits, no surprise breakdowns a week later.
If anything else goes wrong from the same root issue within 6 months, we’ll fix it at no cost to you.
That’s how confident we are in the quality of our $100 diagnostic.
🔧 A Full System Check
🔧 A Full System Check
🔧 A Full System Check
A Full System Check
🚀 Testing for Peak Performance
🚀 Testing for Peak Performance
🚀 Peak Performance Test
Performance Test
🧯 Refrigerant & Leak Inspection
🧯 Refrigerant & Leak Inspection
🧯 Refrigerant Check
Refrigerant Check
⚡️ Electrical Component Review
⚡️ Electrical Component Review
⚡️ Electrical Review
Electrical Review
🎯 Fine-Tuning Your Thermostat
🎯 Fine-Tuning Your Thermostat
🎯 Thermostat Calibration
Thermostat Calibration
🌬️ Filter & Duct Health Check
🌬️ Filter & Duct Health Check
🌬️ Filter & Duct Check
Filter & Duct Inspection
🔒 Ensuring Safe Operation
🔒 Ensuring Safe Operation
🔒 Safety Check
Safety Check
✅ Clear Results & Next Steps
✅ Clear Results & Next Steps
✅ Report & Recommend
Report & Recommend
© OpenStreetMap contributors
© OpenStreetMap contributors
© OpenStreetMap contributors
Service Area
Service Area
Proudly Serving Only Frederick County Residents
Proudly Serving Only Frederick County Residents
Our expert technicians are laser-focused on Frederick County — serving only our local neighbors and families. By staying local, we guarantee fast, reliable service and deep familiarity with the homes and systems in our area.
That’s how we can get to any home in 4 hours or less.
Our expert technicians are laser-focused on Frederick County — serving only our local neighbors and families.
That’s how we can get to any home in 4 hours or less.
Our expert technicians are laser-focused on Frederick County — serving only our local neighbors and families.
That’s how we can get to any home in 4 hours or less.
Why Frederick County Trusts GSSN with Their Homes
A veteran, family-owned business since 2009, we’ve earned the trust of our neighbors in the county — not through fancy marketing, but by treating every home like it’s our own.
A veteran, family-owned business since 2009, we’ve earned the trust of our neighbors in the county — not through fancy marketing, but by treating every home like it’s our own.
A veteran, family-owned business since 2009, we’ve earned the trust of our neighbors in the county — not through fancy marketing, but by treating every home like it’s our own.
A veteran, family-owned business since 2009, we’ve earned the trust of our neighbors in the county — not through fancy marketing, but by treating every home like it’s our own.
We Show Up On Time
We Show Up On Time
Our team calls ahead, arrives on time, and gets the job done right. No more waiting around all day wondering if anyone's actually coming.
Our team calls ahead, arrives on time, and gets the job done right. No more waiting around all day wondering if anyone's actually coming.
Your Home Stays Pristine
Your Home Stays Pristine
Drop cloths, boot covers, and a thorough cleanup. You'd never know we were there — except for the perfectly working system.
Drop cloths, boot covers, and a thorough cleanup. You'd never know we were there — except for the perfectly working system.
Straight Talk, Fair Prices
Straight Talk, Fair Prices
We explain what's wrong in plain English. No pressure, no invented problems. If it's a simple fix, we'll tell you. Even if it means less money for us.
We explain what's wrong in plain English. No pressure, no invented problems. If it's a simple fix, we'll tell you. Even if it means less money for us.
Real Experts
Real Experts
Factory-trained techs who actually know what they're doing. They'll walk you through everything — no guesswork, no YouTube repairs.
Factory-trained techs who actually know what they're doing. They'll walk you through everything — no guesswork, no YouTube repairs.
Have Questions? We've Got You Covered.
Check out our frequently asked questions below or call us anytime at (540) 514-7615 — We're available 24/7 to help you.
Check out our frequently asked questions below or call us anytime at (540) 514-7615 — We're available 24/7 to help you.
How much do you charge for a second opinion?
How much do you charge for a second opinion?
Is there a diagnostic fee?
How much do you charge for a second opinion?
Do you charge extra for emergency visits, or is it always $100?
Do you charge extra for emergency visits, or is it always $100?
Is there a diagnostic fee?
Do you charge extra for emergency visits, or is it always $100?
How will I be charged? I don’t want any surprise fees.
How will I be charged? I don’t want any surprise fees.
How will I be charged?
How will I be charged? I don’t want any surprise fees.
What if it breaks again in 6 months?
What if it breaks again in 6 months?
What if it breaks again in 6 months?
What if it breaks again in 6 months?
Any fine print on the 1-year parts warranty?
Any fine print on the 1-year parts warranty?
Any fine print on the 1-year parts warranty?
Any fine print on the 1-year parts warranty?
Schedule your repair today.
Schedule your repair today.
Schedule your repair today.
Schedule your repair today.
Did you know that approximately 8-12% of our service calls are to come out to fix other companies' mistakes?
Did you know that approximately 8-12% of our service calls are to come out to fix other companies' mistakes?
Your Home Deserves the Most
Trusted Name in Heating & Cooling
Your Home Deserves the Best
Need a new system? Don't worry. GSSN is a proud Daikin Comfort Pro, meaning you get the #1 HVAC system, trusted by millions of homeowners.
They are the pioneers in HVAC, and the scientists behind YOUR perfect comfort.
Available 24/7, Including Weekends
© 2025 GSSN Heating & Cooling, All Right Reserved. Privacy Policy Terms of Use
Available 24/7, Including Weekends
© 2025 GSSN Heating & Cooling, All Right Reserved. Privacy Policy Terms of Use
Available 24/7, Including Weekends
Available 24/7, Including Weekends
© 2025 GSSN Heating & Cooling, All Right Reserved. Privacy Policy Terms of Use