Solar vs. HVAC in Ohio: Which Should You Do First in 2026?

Solar vs. HVAC in Ohio: which should you do first? If your electric bill is high and you're torn between the two, the right answer depends on what's actually causing the bill.

That often means HVAC before solar when the heating or cooling system is old, inefficient or not working right.

But Ohio adds a twist. Before you do either one, check your electricity supplier. Homeowners in competitive utility territories can often lower their generation cost just by switching supply contracts. The PUCO runs its official Apples to Apples comparison site for exactly that reason. So the first decision may really be supplier vs. HVAC vs. solar.

Solar vs. HVAC in Ohio: The Short Answer

HVAC first usually makes more sense when:

• The system is 10–15+ years old
• The AC runs almost constantly
• The heat pump leans on auxiliary heat
• Rooms are uncomfortable
• Humidity is high
• Ducts leak
• Electricity use has gone up noticeably
• Repairs are getting more frequent
• The system will likely need replacing soon anyway

Solar first may make more sense when:

• The HVAC is fairly new and efficient
• Annual usage is stable
• The roof gets strong sun with little shade
• You plan to stay in the home long term
• Solar works under your current utility and supplier arrangement
• No big efficiency problem is inflating your usage

A supplier review may come before both when:

• Your generation rate is above the utility's Price to Compare (its default supply price)
• Your competitive contract is variable
• A promotional rate has expired
• You're paying monthly supplier fees you don't need to

Ohio gives homeowners more than one lever to pull.

What Does HVAC Solve?

HVAC changes how much electricity the home needs. An efficient heating and cooling system can reduce the kWh you buy every year. That matters a lot in Ohio, with its hot, humid summers and long, cold winters.

If your HVAC is wasting electricity, solar doesn't fix the equipment. It just gives you another source of power to run it.

What Does Solar Solve?

Solar changes where some of your electricity comes from. Instead of buying every kWh from the grid, the home makes some of its own.

Solar doesn't fix a failing compressor, leaky ducts, resistance backup heat, poor insulation or bad airflow. It can offset the cost of running with those problems, but the problems are still there.

Example: HVAC First

Say an Ohio home uses 17,000 kWh a year, and the homeowner gets a solar design sized for all 17,000 kWh. But the house has a 16-year-old heat pump, frequent backup resistance heat and leaky ducts.

After replacing the HVAC and fixing the ductwork, usage drops to 13,000 kWh a year. That's 4,000 fewer kWh the solar system needs to cover. Now the homeowner may need fewer panels, a smaller inverter, less roof space and less financing.

The HVAC project didn't rule out solar. It made the solar design better.

Fix the Load Before Paying to Generate the Load

It helps to think about the house in three layers:

1. Load — how much energy does the house need? HVAC and weatherization affect this.
2. Generation — where does the electricity come from? Solar affects this.
3. Storage — when is the electricity available? A battery affects this.

The order usually matters.

Step 1: Check the Supplier Before Spending Thousands

Ohio customers can choose among certified competitive electricity suppliers. The PUCO's Apples to Apples tool lists each active offer's rate, contract terms, monthly fees, early termination fees and renewable content. That means you may be able to save money before replacing a single piece of equipment.

Example: Supplier Savings

For July 1 through September 30, 2026, AEP Ohio's residential generation Price to Compare was 10.97¢/kWh.

Now say a homeowner is paying 14¢/kWh under a competitive supplier contract and uses 12,000 kWh a year. That's a 3.03¢/kWh difference, or about $364 a year in generation cost, before fees and contract terms.

That doesn't replace an HVAC or solar analysis. It just means you should fix the cheap problem first.

Step 2: Figure Out Whether HVAC Is Driving Your kWh

Compare this summer to last summer and this winter to last winter, and look for sharp jumps. Warning signs include:

• A compressor that runs nonstop
• “AUX HEAT” showing up a lot
• Weak airflow
• Uneven temperatures
• Humidity problems
• High winter kWh
• A system older than roughly 10–15 years

If your usage itself has jumped, HVAC deserves to go to the front of the line.

Heat Pumps and Auxiliary Heat Matter in Ohio

Plenty of Ohio homes use heat pumps. When a heat pump can't keep up with the heating load, it may switch on electric resistance backup heat. That backup heat can use far more electricity than normal heat-pump operation.

If you see “AUX HEAT” or “EM HEAT” on the thermostat a lot, look at the HVAC before installing solar. Otherwise you could end up with a solar array sized to cover an equipment problem.

Step 3: Check Insulation and Air Leakage

Sometimes the HVAC isn't the only issue. The home may have thin attic insulation, leaky ducts, air infiltration, worn weatherstripping or leaks around the basement and rim joists. A new HVAC system can't perform its best in a leaky house.

In that case, the right order might be weatherization, then HVAC, then solar.

AEP Ohio Offers a Free Virtual Energy Walkthrough

AEP Ohio's residential programs include a free Virtual Home Energy Savings Walkthrough. A trained advisor reviews your home by video and sends you a customized savings report. AEP also offers an online Energy Dashboard and smart-thermostat programs.

Before you finance major equipment, use the free diagnostic tools first.

Income-Qualified AEP Customers May Have Bigger Opportunities

AEP Ohio's High Efficiency for Low-Income Program (HELP) can help qualifying households. It can provide low- or no-cost HVAC equipment, water heaters, smart thermostats, air sealing and weatherization.

One important update: AEP has paused HELP applications for 2026 and says it plans to reopen them this fall for 2027 assistance. Don't build a current HVAC plan around funding that isn't available right now.

What If the HVAC Is Already Efficient?

Then solar moves way up the list. Picture a home with a 4-year-old heat pump, good insulation, sealed ducts, steady annual usage, a solid roof and owners who plan to stay. There may be very little cheap load reduction left, and solar may be the better next investment.

Ohio's 120% Solar Sizing Rule Matters

Net metering gives you credit for extra solar power you send to the grid. Ohio's net-metering rules require a customer's system to be sized at no more than 120% of the customer's electricity requirements at the time of interconnection. Those requirements are generally based on past usage, typically the prior three years where available. That leaves some room for expected future load.

How HVAC Can Change the Math on Solar Size

Say your home uses 15,000 kWh a year today. Under the 120% rule, a qualifying system could potentially be sized around 18,000 kWh, depending on the actual design and the utility's calculations.

But say an HVAC upgrade brings future usage down to 11,500 kWh. Then a large array designed around the old, inefficient load may no longer be the best financial choice. The legal ceiling shouldn't set your economic target.

Future Electrification Can Push the Other Way

What if you plan to add EV charging, a heat pump, a heat-pump water heater or a home addition? Then your future demand may go up. Ohio's rules let the utility use reasonable usage estimates for situations like new construction or expansion.

So the right solar design should be based on the efficient future home. It shouldn't be a copy of today's usage or however much roof you happen to have.

Solar Economics Depend on Your Supplier, Too

This is another big Ohio difference. A customer with solar can take part in net metering through either the utility's default service or a competitive retail supplier. Ohio's rules recognize both. A competitive supplier can set its own contract terms for excess generation.

So before you install solar, find out who supplies your generation and what that contract says about exports.

Don't Assume the Utility and Supplier Are the Same Thing

For an AEP Ohio customer, AEP Ohio handles local distribution, the meter and interconnection. A competitive supplier may handle the generation supply and the export compensation terms. The same basic split applies in FirstEnergy territory.

That means a technically excellent solar system can still have poor economics if the supply contract is unfavorable.

Ohio Updated Its Interconnection Rules in July 2026

Ohio's revised interconnection rules for distributed energy took effect July 20, 2026. They align utility technical requirements with current standards, including IEEE 1547-2018, UL 1741-SB and the 2023 National Electrical Code. For the simplest (Level 1) review, qualifying inverter-based systems can have export capacity up to 25 kW.

For most homeowners, that means current equipment and interconnection compliance need to be part of any solar proposal.

Compare the Extra HVAC Cost the Right Way

Say your old HVAC has to be replaced no matter what. A standard replacement costs $10,000, and a high-efficiency one costs $14,000.

The efficiency decision isn't really $14,000 vs. $0. It's a $4,000 extra investment in efficiency, and that's what you should weigh against the expected energy savings, comfort and equipment life.

Solar should be judged the same way: net installed cost, financing, current incentives and the utility purchases it avoids. Compare the real alternatives.

What About Comfort?

HVAC does things solar can't. It can improve humidity, temperature balance, airflow, noise, and comfort in both winter and summer.

Solar may lower what you pay for electricity, but it won't make the upstairs bedroom any cooler. That non-financial value matters.

What If the Roof Is Old?

If the roof is close to needing replacement, HVAC may deserve priority even if solar otherwise looks attractive. Installing panels shortly before a reroof can mean removal costs, reinstallation costs and scheduling headaches. Roof condition belongs in the comparison.

What If the HVAC Is About to Fail?

The reverse is true too. If the system is 17 years old, breaks down often and barely cools, solar won't stop you from needing a new HVAC system next year. If your budget or financing is limited, keep the house working first.

Solar May Still Be the Better First Move in the Right Home

Say you already have modern high-efficiency HVAC, strong insulation, steady annual usage and great sun exposure. You also plan to stay for the long haul and have a favorable supplier arrangement. Then there may be little reason to replace equipment that works. In that case, solar can be the logical next step.

What About Batteries?

A battery adds a third decision. It can let you use more of your own solar, shift when you use power and provide backup. But it's usually best evaluated after you understand the home's efficient load, the solar opportunity and your rate and supplier setup.

Don't jump straight from “high bill” to “solar plus battery” without diagnosing the first two layers.

Solar Alone Usually Doesn't Provide Backup

A normal grid-tied system shuts down during an outage to protect the grid and utility workers. Backup typically needs a battery, a backup-capable inverter and transfer or isolation equipment.

If backup power matters to you, say so up front. It changes the whole design.

Solar vs. HVAC: Four Ohio Examples

Home A: HVAC first. A 16-year-old heat pump, frequent backup resistance heat, 18,000 kWh a year and a good roof. Best first move: HVAC and weatherization, then resize the solar.

Home B: Supplier first. Efficient 5-year-old HVAC and good insulation, but a competitive supplier charging well above the current Price to Compare. Best first move: fix the electricity supply, then revisit solar.

Home C: Solar first. New HVAC, an efficient house, 15,000 kWh a year, an excellent roof and a favorable supplier. Best next move may be solar.

Home D: Efficiency first. Middle-aged HVAC, major attic leakage and poor ducts. Best first move: air sealing, insulation and duct repair, then compare HVAC and solar again.

A Simple Ohio Decision Tree

1. Is your supplier expensive? If yes, fix supply first.
2. Is the HVAC failing or inefficient? If yes, HVAC first.
3. Does the home have major insulation or duct problems? If yes, efficiency first.
4. Is usage high and the roof exposure good? If yes, evaluate solar.
5. Is backup power important? If yes, evaluate a battery.

That's a much better process than starting with whichever contractor called you first.

The Ashborn Approach

Ashborn Partners looks at the whole picture before recommending any equipment. That includes your utility (AEP Ohio or FirstEnergy), your electricity supplier, historical kWh, HVAC age and efficiency, auxiliary heat, ductwork, insulation and roof. We also weigh Ohio's 120% sizing rule, export compensation, battery needs and future electrification.

Ohio electricity supplier offers, utility programs and interconnection rules can change. Current Ohio rules limit qualifying customer-generation facilities to 120% of the customer’s electricity requirements at interconnection, and revised interconnection standards took effect July 20, 2026. Always verify the current supplier and utility tariff before modeling solar economics.