Gas furnace, heat pump or both: picking new heat for a Lake City house
Lake City is one of the few Florida markets where a gas furnace is a real option, because the city runs its own gas system and the winters have teeth. Here's how to choose, and how we install what you pick.
Heat pump, gas furnace or both: the Lake City comparison
Most of Florida doesn’t get this choice. Lake City does, because Lake City Utilities runs a natural gas system inside the city limits, propane is everywhere in the county, and the winters bring several freezes a year with the occasional night in the 20s. That makes three honest options.
| Compared | Heat pump with electric backup | Gas or propane furnace | Dual fuel (heat pump plus furnace) |
|---|---|---|---|
| Best at | Mild winter days, which are most of them | Cold nights and fast recovery | Both |
| Running cost in the 40s and 50s | Lowest | Higher | Lowest (heat pump runs) |
| Running cost on a 25-degree night | Highest (strips engage) | Lowest | Low (furnace runs) |
| Equipment | A condenser outside and an air handler inside | Furnace plus separate air conditioner | Heat pump plus furnace, one cabinet |
| Fuel | Electric only | Gas line or propane tank | Both |
| Backup during a power outage | None without a generator | None without a generator (furnace needs power too) | Same |
| Up-front cost | Middle | Middle | Highest |
| Fit | Any home | Homes with gas or propane already | Homes with gas or propane and high heating bills |
Our general read: in the city with gas at the meter, a high-efficiency gas furnace matched with a modern air conditioner is a strong, simple choice. In the county on propane, dual fuel often wins because a unit of heat from propane costs more than one from city gas, so you want the heat pump carrying most of the season. For a home with electric strip heat and no fuel at all, a heat pump is the clear answer. We’ll run the numbers for your house rather than hand you a slogan.
Who’s calling about a furnace
- Owners of 1990s and early-2000s gas furnaces in the older in-city neighborhoods whose fall inspection found a cracked heat exchanger.
- Propane households in Mayfair and across the rural county tired of the winter propane invoice and curious about dual fuel.
- Watertown and manufactured-home owners replacing an electric furnace, deciding between another one and a heat pump.
- Buyers of the frame houses and block ranches near Lake DeSoto who inherited a furnace older than they are and want it sorted before the first freeze.
Three installs, as they typically go around town
A 1952 frame house a few blocks from the Columbia County Courthouse. Natural gas, 80-percent furnace from the 1990s with a cracked exchanger found on inspection. Replaced with a high-efficiency condensing furnace: new PVC flue out the side wall instead of up the old masonry chimney, condensate drain with a neutralizer and a cleanout, new gas flex and shutoff, matched to the existing cooling coil after we verified it. One day, inspected the following week.
A Mayfair home on propane, half-acre lot. Propane furnace and a separate twelve-year-old air conditioner, both tired. The homeowner’s propane bills had doubled over three winters. Dual-fuel install: new Lennox heat pump outdoors replacing the air conditioner, new propane furnace indoors as the backup, thermostat with an outdoor sensor set to switch over at the balance point. The heat pump now carries November, most of December, February and March; the furnace handles the freeze nights. Two days, including the new line set.
An electric-furnace manufactured home outside Fort White, on Clay Electric. Strip heat only, a winter bill to match. Replaced with a packaged heat pump sized for the home and repair of the belly duct underneath. The co-op’s Energy Smart rebate applies to a qualifying heat pump and is paid to the member; we filled out the form on the kitchen table.
Estimate, install, commission
Estimate
A technician visits, measures the house, inspects the existing furnace, flue, gas line or propane setup, duct and electrical, and runs a load calculation. A furnace is sized to the house’s heat loss, not to the old nameplate; oversized furnaces short-cycle and die young. You get a written proposal with the options above priced for your home, the running-cost comparison in plain terms, and the financing available on new equipment. Estimates are free.
Install
Permit pulled. Old furnace disconnected and removed, gas shut off and capped during the work. The replacement furnace set in place and leveled, gas line connected with new flex and a shutoff, flue installed to the manufacturer’s spec, condensate drain run for a condensing unit, electrical and thermostat wiring landed, coil matched or replaced. On a dual-fuel job the heat pump goes in the same day and the control wiring between them is set up so they never run against each other.
Commission
Gas pressure set at the manifold and verified. Combustion analysis at the flue, recorded on your paperwork. Every safety switch tested. Temperature rise across the furnace measured and brought into the manufacturer’s range by adjusting blower speed. Thermostat programmed with you present. Carbon monoxide detectors checked and recommended where missing. Inspection scheduled.
The guarantee on a furnace install
- The combustion numbers are written down and handed to you, so the furnace’s first-day performance is on record.
- Permits and inspections are ours to handle, and the job isn’t finished until the inspector signs.
- Manufacturer warranty registered in your name before the crew leaves; Lennox terms vary by model and are shown on the proposal.
- Labor on the installation is warranted by Cook’s, for the term stated on your proposal [[CONFIRM WITH JERRY]].
- Satisfaction guaranteed. If it isn’t heating the way we said, we come back.
- Same call price at any hour, so a problem on a Saturday night in January costs what it would on a Tuesday.
Gas service: city lines and propane tanks
If your home is inside the city and not yet on gas, Lake City Utilities can tell you whether a main runs past your lot; a new service line is their work, and the furnace is ours. In the county, your propane supplier sizes and sets the tank and runs the line to the house; we size the furnace’s orifices and regulator for propane and coordinate the schedule. Either way, estimates are booked out of the Palm Coast shop and grouped with other Lake City stops, so a little lead time helps. Call 866-266-5709.
Gas, propane or neither: the install questions
Is summer a bad time to replace a furnace?
It’s the best time. Nobody needs heat in July, the schedule is open, and if the furnace shares a cabinet with the cooling coil, replacing both at once in the off-season saves a second visit. We install furnaces year-round regardless.
What do I need to do around the house before install day?
Clear the path to the furnace closet or attic hatch, move anything stored against the unit, and make sure the gas meter or propane tank is accessible. If the thermostat is being replaced, note your schedule so we can program it with you.
How many hours does a furnace install take?
A like-for-like gas furnace swap is most of one working day including commissioning. Add time if the flue is being rerouted for a high-efficiency unit or if the coil and air conditioner are replaced in the same job.
Does Lake City require an inspection on a gas furnace replacement?
Yes. A furnace replacement is permitted mechanical work, and gas work is inspected. Cook’s files the permit with the city or Columbia County based on your address and schedules the inspection.
Can I replace just the furnace and keep my existing air conditioner?
Often, if the air conditioner is in good shape and the new furnace’s blower is matched to the existing coil. We’ll check the match; a mismatch hurts both heating and cooling, and we’ll tell you if the coil has to change.
Other services in Lake City
- A/C ServicesRepair, tune-ups, replacement and commercial work, with the invoice explained before you pay it.
- A/C RepairA quick checklist you can run yourself, then a technician who finishes the job. All brands.
- A/C MaintenanceSpring and fall visits that keep an aging system off the replacement list a few more years.
- A/C InstallationFree estimates, proper sizing, Lennox equipment, and a crew that finishes in a day on most homes.
- ThermostatsReplacement, wiring, heat pump setup and the app, done right the first time.
- GeothermalGround-source heating and cooling for rural lots, designed around the aquifer and the ground under your feet.
- Heating ServicesHeat pumps, gas furnaces, propane, strip heat. Repairs, tune-ups and replacements, any hour.
- Heat PumpRepair, maintenance and new heat pumps for a town that both bakes and freezes.
- Heat Pump RepairDecision tree first, then the fix. Lightning, freezes and humidity are all accounted for.
- Heat Pump MaintenanceTwo visits a year, tuned to the kind of house you live in and the way it was ducted.
- Heat Pump InstallationSized to the house, installed in a day on most homes, with your utility's rebate rules explained.
- Furnace RepairGas, propane and electric furnaces. Safety checks first, then the fix, any hour of the night.
- Furnace MaintenanceA fall inspection that checks the safety side first and the efficiency side second.
- Air QualityHumidity control, filtration, ventilation and purification, matched to the house and the season.
- Indoor Air QualityDehumidification, sealed returns, media filtration and ventilation, done in the order that works here.
- Duct CleaningHonest about when it's worth doing, thorough when it is. Sealing and replacement quoted alongside.
- CommercialRooftop units, splits, make-up air and controls for Lake City's hotels, clinics, shops and warehouses.
Deciding between gas and a heat pump?
Call Cook's for a free estimate on both. We'll put the running costs side by side for your house.