Gas Heat That Keeps Up With Cook County Winters.

Most direct-vent gas fireplace and insert installations in Mount Prospect run between $4,000 and $9,500, depending on the unit, the venting run, and whether an existing gas line is already nearby. Converting an existing masonry fireplace—common in the ranch and split-level homes built here in the 1950s through 1970s—tends to land on the lower end since the chimney chase already exists for a liner. New construction, room additions, or installs that require running a new gas line from the meter can push toward $10,000–$13,000. A local hearth dealer will size the job accurately after seeing your existing chimney or wall layout in person.

Yes, and given how few Mount Prospect homes have a practical way to source or store firewood, this is one of the most common upgrades local dealers handle here. A gas insert slides into your existing masonry firebox, and a stainless liner runs up the current chimney to serve as the vent—no new roof penetration needed. Since Nicor Gas already serves most streets in town, the gas line work is often a short run from an existing appliance rather than a full new service line, which keeps the project closer to the $4,000–$8,500 range for a straightforward conversion.

Rarely. Mount Prospect is fully within Nicor Gas's service territory, so nearly every home already has natural gas plumbed in for the furnace, water heater, or range, and fireplace installers default to tying into that existing service. Propane shows up occasionally for standalone outdoor fire features or in situations where a homeowner wants a fireplace in a detached structure without running gas line that far—but for a primary living space, natural gas is the practical and far more common choice.

Most will, with the right ignition system. Units with IPI (intermittent pilot ignition) run on a small battery backup that automatically takes over when the power drops, so the fireplace still lights on demand. Northwest Cook County sees its share of ice storms and summer derechos that knock out ComEd service for hours at a stretch, so this matters more here than people expect. Valor fireplaces take a different approach—their pilot's thermocouple generates its own electricity, so there are no batteries to remember at all. Ask your local dealer which ignition system is on any unit you're considering if backup heat is a priority.

A gas fireplace is a fully built-in, framed-in unit—the right call for new construction, additions, or a basement remodel without an existing chimney. A gas insert is built to slide into an existing masonry firebox, which fits a large share of Mount Prospect's older housing stock. A gas stove is a freestanding cast-iron or steel unit that sits on the floor and vents through a wall or existing flue, often used in a basement or a room without a fireplace opening at all. For most Mount Prospect homeowners working with an existing brick fireplace, an insert is the simplest and most cost-effective upgrade.

Yes. The Village of Mount Prospect Building Division requires a permit for new gas fireplace installations, and any new gas line work needs to be performed and permitted by a licensed plumber or gas-fitter. In practice, an established local hearth dealer coordinates the building permit, the gas line work, and the final inspection as one package, so you're not left juggling separate contractors and separate permit applications.

Vented (direct-vent) gas fireplaces pull combustion air from outside and exhaust the byproducts back outside through sealed venting—they're the standard choice and the safest option for a sealed-up, well-insulated Illinois home. Vent-free units burn without any outside venting and release some combustion byproducts into the room; Illinois permits them under specific room-size and ventilation rules, but given how tightly built newer Mount Prospect homes tend to be for energy efficiency, most local dealers steer customers toward direct-vent units for indoor air quality reasons. Direct-vent is also simply the more common install here, which makes parts and service easier to find down the road.

Plan on an annual inspection, ideally in early fall before the heating season ramps up. A technician checks the burner, pilot assembly, venting, and gas connections, and cleans the glass and interior—a much smaller job than a wood chimney sweep, but not one to skip given how many months of the year a Mount Prospect household relies on the unit. Expect to pay around $150–$250 for a standard annual service call from a certified hearth technician.

Practicality, mostly. Even though oak, hickory, walnut, and maple are common street and yard trees here, Mount Prospect's residential lots are too small and too close together for stacking and seasoning firewood the way you might in a more rural part of the state, and the Cook County Forest Preserves prohibit cutting standing or downed wood without a permit. Gas, by contrast, gives you instant heat with no ash, no smoke, and no storage problem—which is why gas fireplaces and inserts dominate here while wood stoves are essentially a non-factor. If a wood-fired unit is genuinely something you want, it's still possible on a larger lot, but for the overwhelming majority of Mount Prospect homes, gas is the fit.

If it was installed more than 15 years ago, probably. Older gas fireplaces keep a standing pilot light burning all the time, and that little flame can cost a couple hundred dollars a year. Newer models use pilot-on-demand ignition—the pilot lights only when you use the fireplace and goes out when you turn it off.

Open fireplaces suck—literally. As the fire burns, it consumes air your furnace already paid to heat and pulls it out through the chimney, so the house is actually colder after the fire goes out than before you lit it. An insert fixes this: it seals the chimney, puts fixed glass across the front, and turns that hole in your house into a real heat source.

Yes—by creating a comfort zone. A furnace heats every square foot of the house just to warm the one room you're in; a gas fireplace on low burns roughly a sixth of the gas a typical furnace does. Set the furnace around 55–60 degrees as a baseline, then heat the rooms your family actually uses. Families who heat this way commonly save $20–$60 a month.

If you're putting a fire in your house on purpose, it's best to work with an expert. Unless you're genuinely experienced in framing, gas line, vent pipe, and the national code on clearances to combustibles, have a professional do it—and ideally the same company that sells you the fireplace, so warranty, service, and liability all live under one roof.