First-Time Generator Buyer's Guide: What Every Michigan Homeowner Needs to Know

The generator buying process confuses a lot of first-time buyers because the industry doesn't do a great job of explaining it. You go to a big-box store, see a wall of portable generators, and wonder how any of them relate to what you actually want — something that powers your whole house automatically when the lights go out.

They don't. Those are different products entirely. This guide is about whole-home standby generators: the permanently installed units that start automatically, run on your natural gas or propane supply, and power everything in your house for as long as the outage lasts.

Step 1: Sizing — What You Actually Need

Generator sizing is measured in kilowatts (kW). The right size depends on your home's square footage and, more importantly, which loads you want to power simultaneously.

There are two approaches: whole-home coverage (everything runs as normal) and critical-load coverage (essential systems only, like HVAC, refrigerator, lights, and sump pump). For most SE Michigan homeowners with 2,000–4,000 sq ft homes, whole-home coverage is what we recommend — and it's what most buyers end up choosing once they understand the price difference is smaller than they expected.

Home Size	Recommended Generator	What It Powers	Installed Price Range
Under 1,500 sq ft	11–14 kW	Critical loads + most of home	$9,500–13,000
1,500–2,500 sq ft	16–20 kW	Whole home, single A/C	$11,000–15,500
2,500–3,500 sq ft	20–24 kW	Whole home, dual A/C	$13,500–17,500
3,500–5,000 sq ft	26–36 kW	Whole home including pool, shop	$16,000–22,000
5,000+ sq ft	36–48 kW	Full estate coverage	$20,000–30,000+

These ranges include the generator unit, automatic transfer switch, concrete pad, installation labor, permit fees, and DTE coordination. They assume natural gas supply is already at the home. Propane installs add a tank cost (see below).

Step 2: Fuel Type — Natural Gas vs. Propane

In SE Michigan, most homes have natural gas service through DTE. If yours does, natural gas is almost always the right choice for a whole-home generator. Here's a direct comparison:

For SE Michigan homes with existing natural gas service — which covers most of our service area — natural gas is the right default. The DTE meter timeline adds a few weeks up front, but the ongoing fuel logistics are far simpler. Propane makes sense for homes in rural areas outside DTE's gas distribution network, or for buyers who prefer on-site fuel storage.

Step 3: The Installation Process — What Actually Happens

Understanding the timeline prevents the most common buyer frustration: expecting installation to happen in two weeks and not understanding why it takes closer to eight.

Here's what the process actually looks like for a natural gas whole-home generator in SE Michigan:

1. Site assessment (Week 0). An installer visits your home, evaluates your electrical panel, maps load requirements, identifies the right placement for the generator (setback requirements from windows and doors matter), and gives you a final quote. This takes about an hour. We do this free with no obligation.
2. Permit application (Week 1). Your municipality requires a mechanical/electrical permit for generator installation. We handle this — you sign the paperwork, we submit. Permit approval typically takes 1–2 weeks depending on the municipality.
3. DTE gas meter upgrade request (Week 1). This runs in parallel with permitting. DTE needs to upgrade the gas meter to handle increased gas demand from the generator. Their scheduling queue is currently running 6–10 weeks. This is the critical path item.
4. Installation day (Week 7–10). Once the DTE meter upgrade is complete and permits are in hand, installation takes one to two days on-site. We pour the concrete pad, mount the generator, run the gas connection, install the automatic transfer switch, connect to your panel, and do a full startup and load test.
5. Final inspection (Week 8–11). Your municipality sends an inspector to sign off on the installation. Standard process, typically passes without issue on properly installed units.

Step 4: What's Included vs. What's Extra

Here's where quotes get confusing. A "generator price" you see advertised often doesn't include what it actually costs to have a working generator at your house. Make sure you understand what's in any quote you receive:

• Generator unit itself — the machine that goes on the pad outside
• Automatic transfer switch — the critical component that monitors grid power and transfers your home to generator power automatically
• Concrete pad — most municipalities require a permanent pad (some allow composite pads)
• Gas line extension — running the gas supply from your meter to the generator location
• Electrical connection — connecting the transfer switch to your panel
• Permit fees — varies by municipality, typically $150–400
• DTE coordination — handling the meter upgrade request with DTE on your behalf
• Startup and testing — confirming the system works before the installer leaves
• Manufacturer registration — required for full warranty coverage

A complete, honest quote includes all of these. If a quote looks surprisingly low, ask explicitly what's not included.

Step 5: Maintenance Expectations

A whole-home generator is mechanical equipment. It needs maintenance to stay reliable — especially for something that may sit idle for months and then need to run perfectly on a moment's notice.

Here's what routine maintenance looks like:

• Weekly self-test: Your generator runs itself for 10–15 minutes, usually on a Sunday morning. This keeps the engine lubricated and confirms readiness. It happens automatically — you don't schedule it.
• Annual tune-up: Oil change, spark plugs, air filter, battery check, coolant check, and a full inspection. This runs $150–300 through a qualified service technician. Generac-authorized dealers are required for warranty coverage.
• Battery replacement: The generator's battery (which starts the engine) typically needs replacement every 3–5 years. A $50–80 part, easy to swap.
• Extended run maintenance: If the generator actually runs for 24+ hours during an outage, it needs an oil check (and usually an oil change) before the next extended run.

Budget roughly $200–350/year for maintenance on a properly sized unit. That's the cost of keeping a piece of equipment that needs to start in 30 seconds ready to do exactly that.

Why a Generator Specialist Matters

This is the part of the guide where we'd normally soft-pedal the sales pitch. Instead, let's just be direct about something real.

Generator installation is not standard electrical work. It involves natural gas connections, load calculations, transfer switch specifications, manufacturer certification requirements, municipality-specific permit processes, and DTE coordination. Most licensed electricians have done one or two whole-home generator installs. A generator specialist has done dozens — or hundreds.

The difference shows up in three specific places:

• Sizing accuracy. An experienced installer has seen what happens when a generator is undersized for a home's actual loads. They calculate conservatively and account for future additions (hot tub, EV charger, addition). A generalist installer often sizes from a simple square footage chart and misses edge cases.
• DTE coordination. The gas meter upgrade process has specific submission requirements and common reasons for delays. An installer who does this regularly knows how to submit correctly and how to follow up when something stalls.
• Warranty protection. Generac requires installation by an authorized dealer for the full 5-year residential warranty to apply. An electrician who isn't factory-authorized installs the same physical unit, but your warranty coverage is limited. Ask for certification documentation before signing.

The questions to ask any installer before you commit:

• How many whole-home generators have you installed in the past 12 months?
• Are you Generac (or Kohler/Briggs) factory-authorized? Can you show documentation?
• Do you handle DTE meter coordination directly, or does the homeowner do that?
• What's your realistic timeline from signed contract to operational generator?
• Is your quote all-in, or are permits, the pad, and gas line extension separate line items?
• What's your post-installation support look like? Do you do annual maintenance?

An installer who can't answer those questions confidently and specifically is not the right installer for this job.

Financing Options

A whole-home generator is a significant purchase. Most buyers pay cash or use home equity. A few options worth knowing about:

• HELOC / Home equity loan: Often the lowest interest rate option for a $12,000–18,000 project. The generator adds to home value, making this a reasonable use of equity.
• Manufacturer financing: Generac offers financing through third-party lenders, often with promotional periods. Terms vary — read carefully.
• Installer financing: Some installers (including us) can arrange financing through lending partners. Ask at the time of quote.
• Home improvement loan: Unsecured personal loans for home improvements are available through banks and online lenders. Rates are higher than secured options but simpler to access.

One important note: whole-home generators typically add $5,000–10,000 in appraised home value, depending on the market. In SE Michigan, where buyers actively ask about backup power, a properly installed generator is a genuine selling point.

The Short Summary

If you're reading this and trying to figure out whether to pull the trigger: the process is straightforward, the timeline is predictable, and the decision is simpler than it seems from the outside. You pick a size that covers your home's loads, choose natural gas if you have it, get an all-in quote from a certified installer, and start the process early enough that DTE's timeline doesn't become your problem.

A free site assessment gives you a specific number for your specific home. That's the right starting point.