Heat Pump vs AC: Which Is Best for Savannah’s Climate?

By Bryan Donaldson — Owner, On Time Air. 25+ years of HVAC experience in Savannah, GA.

“Should I get a heat pump or a regular AC with a furnace?” It is one of the most common questions I get from Savannah homeowners, especially anyone buying a home in Pooler, Richmond Hill, or one of the new construction neighborhoods popping up around the metro. The short answer: for most Savannah homes, a heat pump is the better choice. The long answer is below, and it matters because getting this decision right can save you thousands of dollars over the life of the system.

How Each System Works (In Plain English)

A traditional HVAC system in the South is two pieces: a central air conditioner outside that cools your home in summer, and a gas or electric furnace inside that heats it in winter. Two separate systems, two separate fuel sources (usually electricity + natural gas or propane).

A heat pump is a single system that does both. In summer it works exactly like an AC — pulling heat and humidity out of your home and dumping it outside. In winter it runs in reverse, pulling heat out of the outdoor air (even cold air has heat in it) and pumping it into your home. One unit, one fuel source (electricity only), two jobs.

People hear “pulls heat from cold air” and get skeptical. It sounds like magic. It is not. It is a refrigerant cycle, the same physics that makes your refrigerator cold — the heat just moves the other direction. Modern heat pumps work reliably down to about 20°F outdoor temperature, which matters because in Savannah we rarely see temperatures that low.

Why Savannah’s Climate Makes Heat Pumps Almost Always the Winner

Heat pumps are most efficient in mild winter climates, and Savannah’s winters are mild by any definition. Here is what our climate actually looks like:

• Average January low: 38°F
• Average January high: 60°F
• Days per year below 32°F: ~25
• Days per year below 20°F: fewer than 3
• Cooling-dominant season (May-September): 5+ months of serious AC demand

Compare that to where heat pumps struggle — places like upstate New York or Minnesota where winter temperatures stay below 20°F for weeks. Those climates call for a furnace or a dual-fuel hybrid system. Savannah is the opposite. We cool our homes for 7 months a year and heat them gently for 4. A heat pump is built for exactly this.

The Department of Energy has documented that modern heat pumps can reduce heating electricity use by up to 50% compared to electric resistance heating or baseboard heaters. In coastal Georgia specifically, we see homeowners save $400–$900 per year on winter heating bills after switching from an old furnace to a modern high-SEER heat pump.

Heat Pump vs AC + Furnace: The Honest Comparison

Upfront cost

A heat pump system and a comparable AC + gas furnace combo cost about the same to install in Savannah — $8,500–$14,000 depending on home size, SEER rating, and brand. Heat pumps used to cost more upfront; that is no longer true.

Monthly operating cost

This is where heat pumps win in Savannah. For most homes, a heat pump runs $30–$75/month less in winter than a gas furnace. In summer, cooling costs are essentially identical (a heat pump is an AC when it is cooling). Over a 15-year system life, that adds up to $5,000–$13,000 in savings.

Comfort

Heat pumps deliver heat at a lower temperature than gas furnaces (about 90°F at the vent vs 120°F+ from a furnace). Some homeowners describe heat pump air as “cool.” In reality it heats your home effectively — it just does so gently and continuously rather than in short blasts. Modern variable-speed heat pumps have largely solved this complaint.

Equipment lifespan

A well-maintained heat pump lasts 12–15 years in Savannah — slightly shorter than an AC-only unit (14–18 years) because the heat pump works year-round while an AC only runs half the year. Regular annual maintenance is critical for getting full life out of either system.

Backup heat

All heat pumps installed in Georgia come with electric “emergency heat” strips for the handful of nights per year when temperatures drop below 20°F. These are cheap to run for short periods but expensive if used for weeks at a time. In Savannah we almost never need them.

Natural gas dependency

If your home does not have natural gas service, a heat pump is a clear winner. Running propane or using electric resistance heat is significantly more expensive than a heat pump.

When an AC + Furnace Actually Makes More Sense

I am not going to pretend heat pumps are the right answer for every Savannah home. There are a few cases where I still recommend a traditional AC + gas furnace:

• You already have a high-efficiency gas furnace that is under 8 years old. If your AC fails but your furnace is young and healthy, just replacing the AC is cheaper than replacing both with a heat pump.
• You heavily value the “feel” of hot-air heat. Some homeowners simply prefer the quick warmth of a gas furnace and are willing to pay more for it.
• You live in a home with very low natural gas rates. If your utility offers cheap natural gas (rare in Savannah), the math can favor a furnace for winter heating.
• You’re adding on to an existing system with an older gas line already in place. Retrofit costs can swing the math.

What Size Heat Pump Does a Savannah Home Need?

Sizing is where I see the most expensive mistakes happen. A heat pump that is too big will short-cycle, remove less humidity, and wear out faster. Too small and it cannot keep up on hot days. Rough guidance for Savannah homes:

• 1,200–1,500 sq ft: 2.0–2.5 ton heat pump
• 1,500–2,000 sq ft: 2.5–3.0 ton heat pump
• 2,000–2,500 sq ft: 3.0–3.5 ton heat pump
• 2,500–3,500 sq ft: 3.5–5.0 ton heat pump (often with zoning)

These are estimates only. A proper Manual J load calculation — required by Georgia code for new installations — accounts for insulation, window area, orientation, ceiling height, and ductwork. Any good HVAC contractor should run Manual J before quoting a system size. If they do not, get a different quote.

SEER Ratings: What’s Worth Paying For in Savannah?

SEER2 (Seasonal Energy Efficiency Ratio, updated standard since 2023) measures how efficiently a heat pump or AC uses electricity. Higher is better. Options in Savannah:

• 14.3 SEER2 (minimum legal): Cheapest upfront, highest long-term operating cost. I do not recommend this tier for Savannah homes unless budget is the only factor — you will pay the difference in summer electric bills.
• 15–16 SEER2: The sweet spot for most Savannah homes. Meaningful efficiency gains over minimum, reasonable upfront cost.
• 17–18 SEER2: Premium tier. Variable-speed compressors, better dehumidification, quieter operation. Worth it for larger homes or anyone who runs AC 10+ months per year.
• 19+ SEER2: Luxury tier. Rarely pays back in Savannah unless you are planning to stay in the home for 15+ years.

Our Recommendation for Most Savannah Homes

If you are building, buying, or replacing a failed system in Savannah and you do not already have a young gas furnace, install a 15–16 SEER2 heat pump sized with a proper Manual J load calculation. This setup gives you the best lifetime value for our coastal Georgia climate. For homes over 2,500 sq ft or anyone in Richmond Hill, Pooler, or The Landings who wants maximum comfort, bump up to a 17–18 SEER2 variable-speed unit.

Whatever you choose, insist on a detailed written quote that lists the exact model number, SEER2 rating, tonnage, warranty terms, and installation scope. Be wary of quotes that just say “3-ton system, $9,500.” You deserve to know what you are buying.

Need Help Choosing Between a Heat Pump and AC?

We install and service heat pumps from Goodman, Carrier, Trane, Lennox, and Rheem across Savannah, Pooler, Tybee Island, Richmond Hill, Rincon, and the surrounding Chatham, Bryan, and Effingham county communities. We also offer financing options to make the numbers work.

Call us at 912-210-4901 or request a free in-home estimate. We will walk through your home, do a proper load calculation, and give you an honest recommendation — whether that turns out to be a heat pump, an AC with a furnace, or keeping what you already have for another year.

Frequently Asked Questions

Do heat pumps work in Savannah’s humid summers?
Yes — extremely well. When operating in cooling mode, a heat pump is identical to a central AC. Modern variable-speed heat pumps are especially good at dehumidification, which matters a lot in coastal Georgia’s high-humidity summers.

Will a heat pump keep my Savannah home warm enough in winter?
Yes. Savannah’s winter lows average 38°F, and heat pumps maintain full heating capacity down to about 20°F. For the rare nights we dip below that, your system’s backup electric strips kick in automatically.

How much does a heat pump cost to install in Savannah?
Expect $8,500–$14,000 for a full installed system in 2026 — similar to an AC + furnace combo. The exact price depends on home size, SEER2 rating, brand, and whether your existing ductwork needs modification.

How long do heat pumps last in Savannah?
12–15 years with proper annual maintenance. The biggest factors that shorten heat pump life in Savannah are dirty filters, blocked outdoor units (Spanish moss and vegetation), and deferred maintenance.

Are there tax credits for installing a heat pump?
Yes — the federal Inflation Reduction Act offers up to $2,000 in tax credits for qualifying high-efficiency heat pump installations, plus potential state and utility rebates. Ask us about current incentives during your estimate.