A Generac generator gives Gaithersburg homeowners dependable backup power when Maryland storms knock out electricity. GAC Services installs, maintains, and repairs Generac standby generators throughout Gaithersburg, Montgomery County, Frederick County, and Howard County. As an authorized Generac dealer serving Maryland since 1970, our licensed electricians help homeowners select the right generator, complete the installation, and keep it ready for the next outage.
Power outages interrupt heating and cooling systems, refrigeration, lighting, internet service, medical equipment, and other essential appliances. A permanently installed Generac standby generator restores power automatically, helping your home continue operating even when utility power is unavailable.
Schedule Online or call (240) 224-0192 for a free estimate.
Schedule OnlineWhy choose a Generac standby generator?
A Generac standby generator automatically restores power within seconds of an outage, protecting your home without requiring you to start or refuel a portable generator.
Unlike a portable generator that must be moved into position and connected manually, a standby generator remains permanently installed outside your home and operates automatically through an automatic transfer switch (ATS). When utility power is restored, the system safely transfers your home back to the electrical grid without homeowner involvement.
Generac standby generators offer:
- Automatic operation during power outages
- Permanent outdoor installation
- Operation on natural gas or propane
- Multiple generator sizes for different homes
- Reliable whole-home backup power
- Manufacturer warranty coverage
- Quiet operation and automatic self-testing
Whether you want to keep essential circuits operating or power your entire home, GAC Services helps determine which Generac Guardian Series model best fits your household.
What size Generac generator do I need?
The right generator size depends on the size of your home and which appliances and electrical systems you want to operate during a power outage. GAC Services performs a load assessment to properly size every generator before installation.
Generac Sizing Guide
| Generator Size | What It Typically Powers | Best For |
|---|---|---|
| 10–14 kW | Refrigerator, furnace, lights, selected outlets | Smaller homes and essential circuits |
| 18–22 kW | Most household circuits including HVAC | Typical 3–4 bedroom homes |
| 24–26 kW | Whole-home backup including larger HVAC systems and major appliances | Larger homes |
| Over 26 kW | High electrical demand and luxury homes | Large estates and specialty loads |
Generator size depends on more than square footage. Air conditioners, electric water heaters, heat pumps, EV chargers, pools, workshops, and other large electrical loads all influence the proper generator size.
Rather than estimating, GAC Services performs a complete electrical load assessment so your generator provides the level of backup power your household expects.
Generac installation, maintenance & repair
Professional installation ensures a Generac generator operates safely, transfers power correctly, and complies with local electrical and fuel-gas codes. GAC Services manages the entire project from the initial load assessment through final testing so your backup power system is ready before the next outage.
Our installation process includes:
- Home assessment and load calculation. We evaluate your electrical usage, determine the proper generator size, and provide an upfront estimate based on the equipment your household wants to operate during an outage.
- Permits and planning. GAC Services obtains the required permits, coordinates inspections when necessary, and plans the installation to meet local electrical and building requirements.
- Generator pad, fuel, and electrical connections. The generator is installed on a permanent pad, connected to either the natural gas or propane supply, and wired to your home's electrical system.
- Automatic transfer switch installation. The automatic transfer switch is installed and configured to detect utility outages, start the generator automatically, and safely transfer power back to the utility once service is restored.
- Testing and homeowner walkthrough. Before the project is complete, we test the generator under operating conditions, verify automatic transfer operation, and explain routine operation and maintenance requirements.
Routine maintenance helps keep your generator ready for unexpected outages while supporting manufacturer warranty requirements. Regular inspections include oil and filter changes, battery testing, software updates when applicable, and complete operational testing.
If your generator develops starting problems, warning lights, transfer switch issues, or performance concerns, GAC Services also provides generator repair. Homeowners planning a complete backup power system can also learn more about generator installation and whole home generators.
Natural gas vs. propane for your generator
Both natural gas and propane provide dependable fuel for a Generac standby generator. The best choice depends on the utilities already available at your home and how you want the backup power system to operate.
| Natural Gas | Propane | |
|---|---|---|
| Fuel supply | Connects directly to your utility gas line | Stored in an on-site propane tank |
| Runtime in a long outage | Continuous while utility gas service is available | Limited by tank size and the load being powered |
| Refueling | None needed | Tank is refilled as it depletes |
| Best suited for | Homes with existing natural gas service (common in Montgomery County) | Homes without natural gas service, including rural areas |
Natural gas generators connect directly to the home's existing utility gas service, eliminating the need to refill fuel during extended outages as long as natural gas service remains available. This makes natural gas a popular choice throughout much of Montgomery County where utility gas service is common.
Propane generators are an excellent solution for homes without natural gas service. Fuel is stored in an on-site propane tank, allowing homeowners in rural areas or neighborhoods without gas utilities to install the same automatic standby generator technology.
If propane service or new gas piping is required, GAC Services also performs gas line repair & installation as part of the project, allowing homeowners to work with one contractor throughout the installation.
Why choose GAC Services?
Since 1970, GAC Services has helped homeowners throughout Gaithersburg, Montgomery County, Frederick County, and Howard County prepare for power outages with professionally installed backup power systems. As an authorized Generac dealer, our licensed electricians install equipment according to manufacturer specifications while providing straightforward recommendations based on your home's electrical needs.
Homeowners choose GAC Services because we offer:
- Authorized Generac dealer
- Licensed Maryland electricians (MD Electric #14663)
- Family-trusted service since 1970
- Upfront pricing and free estimates
- Financing options for qualified homeowners
- Hero discounts for military members and first responders
- Prime Maintenance membership
- Professional installation, maintenance, and repair throughout Gaithersburg, Rockville, Germantown, Silver Spring, Bethesda, Potomac, Frederick, and surrounding communities
Protect your home before the next power outage with a professionally installed Generac standby generator from GAC Services. Our licensed electricians provide generator sizing, installation, maintenance, and repair throughout Gaithersburg, Montgomery County, Frederick County, and Howard County with upfront pricing, financing options, and trusted service backed by more than 50 years of experience.
Schedule Online or call (240) 224-0192 today to request your free Generac generator estimate.
Schedule OnlineFrequently Asked Questions
Most three- to four-bedroom homes are well served by an 18–22 kW standby generator, while larger homes often require a 24–26 kW model. The correct size depends on the electrical loads you want to operate during an outage, which is why GAC Services performs a professional load assessment before installation.
A properly maintained Generac standby generator commonly lasts 20 to 30 years, or approximately 3,000 operating hours. Annual maintenance helps maximize service life, supports warranty coverage, and keeps the generator prepared for unexpected outages.
Both fuel options provide dependable standby power. Natural gas offers continuous fuel through the utility system where available, while propane serves homes without natural gas service. GAC Services recommends the option that best matches your property's existing utilities.
Yes. Standby generator installations typically require permits and inspections to verify compliance with local electrical, plumbing, and fuel-gas codes. GAC Services manages the permitting process as part of the installation.
A natural gas generator can continue operating as long as utility gas service remains available. Propane runtime depends on the size of the storage tank and the electrical load being powered during the outage.
Yes. GAC Services performs routine maintenance, warranty service, and repairs for Generac standby generators to help keep your backup power system operating reliably year after year.
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