Backup Power, Built Like Your HVAC.
From the team that keeps your furnace running in January and your AC cold in July — now keeping your whole home powered when the grid fails. As your authorized Generac dealer in Metro Detroit, NEXT Heating & Cooling handles every step from sizing to activation.
Not sure what size you need? See the sizing guide ↓
When the Grid Drops, Your HVAC Drops With It.
Michigan ranks among the worst states in the country for sustained outage hours, and when the lights go off your furnace and AC go with them — that's where the real damage starts. Burst pipes during a January ice storm. A July heat wave with no air conditioning. A sump pump that quits mid-rainstorm and floods your basement. A Generac home standby system keeps every critical HVAC and life-safety circuit running automatically.
The #1 Selling Brand of Home Standby Generators
Generac invented the home standby generator category and has built the most trusted, most installed backup power systems in North America for over 60 years.
Power On in Seconds
The moment your utility power drops, your Generac fires up automatically. Heat resumes. The AC kicks back on. The sump pump keeps draining. All within ten seconds — no flip switch, no waiting.
Runs On Your Existing Gas
The same natural-gas line that fuels your furnace fuels your generator. No tanks to refill, no fuel cans, no schedule to track. While the utility gas keeps flowing, your power keeps flowing.
Whole-Home Coverage
Properly sized, a Generac runs every HVAC system in your home alongside the refrigerator, sump pump, well pump, lighting, and outlets. The 18 to 26 kW range handles whole-home coverage — including central AC and electric heat — for most Metro Detroit households.
5-Year Limited Warranty
A 5-year limited warranty comes standard with every Guardian Series unit. Because NEXT Heating & Cooling is a factory-authorized service dealer, warranty work is handled by our same in-house team — no third-party dispatch, no waiting for a contractor we don't know.
Which Generac Is Right for Your Home?
Generac home standby generators are sized in kilowatts (kW). The right unit depends on your home's size, the appliances you want running during an outage, and your fuel source. NEXT performs a full load calculation as part of every free estimate.
Below is a general guide to help you understand the Guardian Series. Most Metro Detroit homes land in the 18 kW to 24 kW range for full whole-home coverage. We confirm exact sizing on-site as part of your free estimate.
Covers the essential circuits during an outage: furnace blower, refrigerator, well pump, sump pump, and core lighting. A practical pick if you want continuity on heat and water without backing up the whole house.
- Refrigerator & freezer
- Furnace blower & thermostat
- Sump pump & well pump
- Select lighting & outlets
Suited for smaller homes (under roughly 2,500 sq ft) with full HVAC coverage minus central AC. A reasonable middle ground if your household is comfortable letting AC pause during summer outages.
- Everything in the 10 kW
- Kitchen — stove, microwave
- Laundry — washer & dryer
- Most of the home's lighting
The sweet spot for typical Metro Detroit homes (2,000–3,500 sq ft): full whole-home backup including the furnace and central AC running simultaneously. The size most NEXT Heating & Cooling installs land at.
- Whole-home electrical
- Central air conditioning
- Multiple HVAC zones
- Home office & Wi-Fi
Adds capacity for multi-zone HVAC, dual condensers, hot tubs, EV chargers, and finished basements. The right pick when your electrical panel routinely runs heavier than typical 200-amp service.
- Everything in the 18 kW
- Dual AC units
- Hot tub or pool equipment
- EV Level 2 charger
Sized for larger homes (4,000+ sq ft) or those with electric-resistance heat or a heat pump — both of which draw significant amperage. Runs every HVAC zone plus the rest of the home without load-shedding.
- Whole-home, no load shedding
- Electric heat or heat pump
- Finished basement systems
- Outbuildings & workshops
The largest residential Guardian unit. Suited for estate-scale homes with three or more HVAC zones, multiple electrical sub-panels, detached workshop circuits, or both electric heat and electric water heating on the same service.
- 5,000+ sq ft homes
- Three or more HVAC zones
- Detached garage / workshop
- Maximum reserve capacity
Final pricing depends on your home's existing electrical panel, gas-line capacity, placement, and permitting. NEXT provides a written, no-obligation quote after the on-site visit.
Spread It Over Monthly Payments
You don't have to pay for backup power all at once. NEXT Heating & Cooling works with multiple home-improvement lenders so qualified homeowners turn a Generac install into a manageable monthly payment. The pre-qualification process takes minutes and doesn't impact your credit score.
Three Reasons Homeowners Choose NEXT for Generac
Buying a generator is one decision. Maintaining it for the next decade is another. NEXT Heating & Cooling already services the critical systems in Metro Detroit homes — furnaces, AC, water heaters, ductwork. Generators fit right alongside that work.
New Installation, Done Right
A Generac install is more than dropping a unit on a pad. NEXT handles the full job — start to finish — under one roof.
- Free on-site sizing & load calculation
- Concrete pad & placement permits
- Natural gas or LP line installation
- Automatic transfer switch wiring
- Final startup, testing & activation
- Mobile Link™ pairing on your phone
Maintenance That Keeps It Ready
A generator you never test is a generator that fails when you need it most. NEXT keeps yours storm-ready with annual service.
- Oil & filter changes
- Air filter & spark plug service
- Battery testing & replacement
- Full diagnostic load test
- Firmware & transfer-switch checks
- Annual maintenance plans available
Authorized Warranty Service
Generac only honors warranty repair work performed by an Authorized Service Dealer. Because NEXT carries that certification, every warranty claim runs through us — directly, factory-backed.
- Factory-trained, certified technicians
- Direct line to Generac technical support
- Factory-direct OEM parts
- Warranty claims handled in-house
- Extended warranty options available
- FLEET remote diagnostics platform
Approved by the #1 Name in Backup Power.
Generac is the most installed home standby generator brand in North America — and they don't put their name on just any contractor. NEXT Heating & Cooling earned a spot on Generac's official Authorized Service Dealer roster by passing factory qualification, completing certified technician training, and stocking the certified Level 1 Service Parts Kit. The same team Metro Detroit homeowners already trust for heating and cooling is now factory-certified to handle backup power too.
Factory-Vetted
Passed Generac's dealer qualification process
Factory-Trained Techs
Certified through Generac's technician program
Direct Factory Support
Priority technical support line, exclusive to authorized dealers
OEM Parts On Hand
Factory-direct parts kit stocked for fast service
One Less Thing to Worry About This Storm Season.
Send us a few details about your home and a NEXT Heating & Cooling specialist will follow up within 24 hours to schedule your free on-site assessment. No phone estimates. No pressure.
From First Call to First Outage — Four Steps
A typical Generac install takes 4 to 8 weeks from first call to commissioning, depending on permit timelines and equipment availability.
Free On-Site Estimate
A NEXT technician walks your property, measures your electrical and HVAC load, plans the placement, confirms gas supply, and writes a no-obligation quote on the spot.
Permitting & Sizing
We file the municipal electrical and mechanical permits, schedule the utility coordination, and order your right-sized Generac unit and transfer switch.
Installation Day
Pad, gas line, electrical run, transfer switch, and the unit itself all go in across a single 1-to-2-day visit. Our HVAC and electrical crews work from one schedule — no contractor coordination on your end.
Activation & Walkthrough
We pass municipal inspection, run the factory startup procedure, simulate an outage to validate the transfer switch, pair Mobile Link™ to your phone, and walk you through the system before leaving.
Annual Maintenance — Storm-Ready, Year After Year
Your Generac generator runs a self-test every week, but it still needs hands-on annual service to stay reliable. Built on the same trusted Care Plan model NEXT already uses for furnaces and AC across Metro Detroit — your Generator Care Plan handles every recommended service interval automatically.
- Annual oil, filter, and spark-plug service
- Battery test & replacement (when needed)
- Full system load test & transfer-switch check
- Mobile Link™ alerts monitored by NEXT
- Priority response on warranty repairs
Get Your Free Generac Quote
Tell us about your home and we'll be in touch within 24 hours to schedule your free on-site assessment.
Request My Generac Quote
A NEXT specialist will reach out within 24 hours to schedule your free on-site assessment.
We've Got Your Request!
A NEXT specialist will reach out within 24 hours to schedule your free on-site Generac estimate. Need it sooner? Call (844) 279-HVAC.
Everything Homeowners Ask About Generac
The most common questions we get from Metro Detroit homeowners considering a Generac home standby generator — answered straight.
What is a Generac home standby generator?
How much does a Generac generator cost installed in Metro Detroit?
Is financing available?
What size Generac generator do I need for my home?
Does a Generac run on natural gas or propane?
How long can a Generac run during an outage?
How long does Generac installation take?
Why does it matter that NEXT is an Authorized Generac Service Dealer?
Is a Generac generator loud?
Can I monitor my Generac from my phone?
What warranty comes with a Generac generator?
Do I need a permit to install a Generac generator?
Does NEXT service generators I bought somewhere else?
Where We Install & Service Generac
The same Metro Detroit communities NEXT Heating & Cooling already serves for furnace and AC work — Macomb, Oakland, and St. Clair counties plus the surrounding suburbs listed below.