Start by matching your insert to your chimney’s size and your home’s heating needs. Longmont’s dry winters mean you’ll want a model with strong draft control and low creosote buildup. Always pair it with a professional chimney sweep before installation to check for hidden damage or blockages, especially in older homes near downtown or the foothills.
What is a fireplace insert, and why does it matter in Longmont?
A fireplace insert is a self-contained heating unit that fits inside your existing fireplace, using wood, gas, or pellets to generate heat more efficiently than an open flame. In Longmont, where older homes (especially in neighborhoods like the Olde Town area) often have outdated fireplaces, inserts can cut heating costs by up to 30% while reducing smoke and creosote buildup, a critical factor given our dry, windy winters. Without one, your chimney may struggle with poor draft, leading to smoke spilling into your home or even chimney fires. The key is choosing an insert that matches your chimney’s dimensions and your family’s heating habits. For example, a wood-burning insert may suit a larger home in the foothills, while a gas insert could be ideal for a smaller downtown condo with limited storage. There is more in the services we offer.
Step 1: Measure your fireplace opening, don’t guess
Before shopping, measure your fireplace’s width, height, and depth. Longmont’s historic homes often have irregular openings, so precise measurements are a must. A standard insert fits openings between 36 and 42 inches wide, but older homes near the St. Vrain Creek area might have narrower or taller fireplaces. If your measurements don’t match common sizes, you’ll need a custom insert, expect to pay 20–50% more. Pro tip: Use a tape measure at the widest and narrowest points, and check the depth from the front edge to the back wall. If your chimney is lined with old, cracked masonry, you’ll also need a chimney sweep to assess structural integrity before installation. Our Longmont chimney sweep team can measure your fireplace and recommend inserts during a free inspection, no obligation.
Step 2: Pick your fuel type, wood, gas, or pellet?
Your choice depends on your budget, convenience, and Longmont’s air quality regulations. Wood-burning inserts are the most affordable upfront ($1,500–$4,000) but require regular chimney sweeps (every 1–2 years) to prevent creosote buildup, a sticky, flammable residue that’s a leading cause of chimney fires in Colorado. Gas inserts ($2,500–$6,000) offer cleaner burns and easier ignition but depend on propane or natural gas lines, which may need upgrades in older homes. Pellet inserts ($2,000–$5,000) use compressed wood pellets and are highly efficient, but they require storage space for fuel. The EPA’s Burn Wise program the EPA's Burn Wise program recommends wood-burning inserts only if they meet EPA Phase 2 emissions standards, check the label before buying. For Longmont’s smoky air, a gas or pellet insert might be the safer long-term choice. Take a look at request a free estimate / contact us.
Step 3: Check your chimney’s draft and condition
A chimney sweep is your first step here. Longmont’s variable winds and high elevation can create draft issues, especially in chimneys with cracks or missing caps. During a Level 1 chimney inspection the Chimney Safety Institute of America (CSIA)|https://www.csia.org/)), a professional will check for obstructions, creosote levels, and structural damage. If your chimney has a liner, it must be compatible with your insert’s heat output, some inserts require stainless steel liners, while others work with clay. Older homes in the Table Mesa area often have unlined chimneys, which may need relining before installation. A chimney sweep can also confirm whether your chimney meets NFPA 211 standards the National Fire Protection Association (NFPA)|https://www.nfpa.org/)) for clearances to combustible materials. Skipping this step could void your insert’s warranty or, worse, create a fire hazard.
Step 4: Compare efficiency ratings and heating capacity
Look for inserts with an efficiency rating of 75% or higher. In Longmont’s cold snaps (where temperatures can drop below 10°F), a higher rating means more heat stays in your home and less goes up the chimney. Heating capacity is measured in BTUs, aim for 30–50 BTUs per square foot of your home’s living space. A 2,000-square-foot home in the foothills might need a 60,000–80,000 BTU insert, while a smaller downtown home could get by with 30,000–40,000 BTUs. Overestimating can lead to short burn times and excessive creosote, while underestimating means your insert won’t heat the room effectively. Some inserts also include blower fans to circulate heat, useful for open-concept Longmont homes where fireplaces are central to the living space.
Step 5: Factor in installation and local codes
DIY installation isn’t recommended for fireplace inserts, especially in Longmont where building codes vary by neighborhood. A licensed professional will ensure proper clearances to walls, ceilings, and combustible materials, critical in older homes with wood siding or plaster walls. Permits may be required, depending on your insert type and whether your chimney needs modifications. Longmont’s building department Longmont, CO often checks for proper venting and emissions compliance. After installation, schedule a chimney sweep to remove any debris left from the process. Our team handles insert installations and chimney sweeps in one visit, contact us for a free estimate to avoid scheduling headaches.
Step 6: Budget for long-term costs (not just the sticker price)
A fireplace insert’s upfront cost is just the beginning. Wood inserts require firewood (expect $3–$5 per cord in Longmont), while gas inserts add fuel costs and potential line upgrades. Pellet inserts need regular hopper cleanings and pellet deliveries. Maintenance varies: wood inserts may need annual sweeps, while gas inserts require yearly inspections of burners and vents. Some inserts come with 1–5 year warranties, but labor for repairs isn’t always covered. If you’re unsure about the total cost, our pricing guide breaks down average expenses for Longmont homeowners. Remember, a poorly chosen insert can lead to higher heating bills, chimney damage, or even a house fire, so invest in quality upfront.
| Type | Fuel | Upfront Cost (Longmont Range) | Annual Maintenance Cost | Best For |
|---|---|---|---|---|
| Wood | Cordwood | $1,500–$4,000 | $150–$300 (sweeping + firewood) | Heirloom homes, high heat output |
| Gas | Propane/Natural Gas | $2,500–$6,000 | $100–$250 (inspections + fuel) | Convenience, low emissions |
| Pellet | Wood Pellets | $2,000–$5,000 | $200–$400 (pellets + cleaning) | Efficiency, automated feeding |
| Vent-Free Gas | Natural Gas | $1,200–$3,000 | $50–$150 (inspections only) | Supplemental heat (check local codes) |
Frequently Asked Questions
My chimney smells musty even after sweeping. Could a fireplace insert fix that?
A musty chimney smell usually means moisture or old creosote. A wood-burning insert can help by improving airflow and reducing humidity buildup, but gas or pellet inserts are better for eliminating odors entirely. First, confirm your chimney has a proper cap and no cracks, our Longmont chimney sweep team can diagnose the source. If moisture is the issue, a chimney liner upgrade might be needed before installing an insert.
Why does my Longmont home’s fireplace draft poorly, even with a new insert?
Poor draft is often caused by a blocked or undersized chimney. Longmont’s high winds can also disrupt airflow, especially in chimneys without storm caps. Check if your insert’s heat output matches your chimney’s size, the Chimney Safety Institute of America the Chimney Safety Institute of America (CSIA)|https://www.csia.org/)) recommends a draft test after installation. If the problem persists, a chimney sweep can inspect for creosote buildup or structural issues blocking the flue.
Is a DIY fireplace insert setup a good idea for my new home on Table Mesa Drive?
While some homeowners DIY minor fireplace projects, inserts require precise measurements, gas line connections (if applicable), and compliance with local codes. Mistakes can void warranties or create fire hazards. Longmont’s building department may also reject unpermitted installations. Our certified technicians handle installations safely and efficiently, plus, we offer free estimates to avoid costly errors.
How often should I have my chimney swept after installing a new insert in Longmont?
Wood inserts need sweeping every 1–2 years, depending on usage. Gas and pellet inserts require annual inspections for vent blockages or burner issues. The NFPA the National Fire Protection Association (NFPA)|https://www.nfpa.org/)) recommends sweeping at least once a year for all inserts. Schedule a sweep with our Longmont team before your first winter burn to ensure safety.