Heating system installation must be done right. A poor install can cost you for years. If you live in Kansas City, a wrong step can mean a cold night and a big bill. This guide shows seven common mistakes to avoid. Read slow. Do one small step at a time.
1. Choosing the wrong size unit
Many people pick a unit by guess. A unit that is too big will cycle on and off. This wastes fuel and makes the house feel damp. A unit that is too small will run all day and still feel weak. Ask a pro to do a load calculation. The right size keeps your home comfy and saves money.
2. Ignoring ductwork condition
Old ducts may leak warm air into attics and crawl spaces. Leaky ducts waste heat and raise bills. New units work poorly on bad ducts. Have the ducts inspected. Seal gaps with mastic or foil tape. Insulate ducts in cold areas. Fixing ducts first makes the new system work better and last longer.
3. Skipping permits and code checks
Some installs need local permits and code checks. Skipping these can lead to fines or failed inspections. It can also void warranties. Always ask the installer if permits are needed. A licensed tech will follow rules and pass the final check. Paperwork keeps you safe and your home legal.
4. Poor location and clearance
Placing the unit in a cramped closet or wet space is a bad choice. The unit needs clear space for service. Outdoor units need airflow and room to clear snow. If the tech cannot reach the unit, work will cost more. Pick a dry, open spot and leave at least two feet around the unit when you can.
5. Choosing the wrong filter or ignoring airflow
A heavy filter can improve air quality but may block airflow in older systems. Too much resistance makes the fan work hard. Ask the tech which filter grade your system can handle. Clean filters let the system move air easily. Change filters every 1–3 months. Good airflow means better heat and lower energy use.
6. Not pairing the right thermostat and controls
A new system must match good controls. Old thermostats can make even a good new unit waste energy. A smart or programmable thermostat helps cut bills by lowering heat when you sleep or leave. Ask the installer to test the control with the new unit. Learn the basic settings before they leave.
7. Overlooking safety and venting
Gas systems need tight gas lines and proper venting. A cracked heat exchanger or a wrong flue can leak carbon monoxide. This is a life threat. Make sure the tech tests for leaks and checks the heat exchanger. Install carbon monoxide alarms near bedrooms. Safety checks are not optional.
Extra pitfalls to watch for
Hidden costs can come from poor wiring, wrong gas pressure, or bad condensate drainage. Ask for a full list of work and parts in writing. Get the labor warranty in writing too. Keep a copy of all papers. A clear bill helps you plan and avoid surprise costs.
How to pick a good installer
Look for a licensed, local company. Ask for references and read reviews. Ask what tests they run after install. Ask if they seal ducts and test for leaks. A good installer explains steps in plain words. Ask about service plans and a fall tune-up. Good help keeps your new system running well.
Small steps you can do before and after install
Clear space around the old unit. Move fragile things from the work area. Change the filter before the tech arrives. After install, test CO and smoke alarms. Learn how to change the filter and set the thermostat. Book a yearly tune-up to keep the warranty and catch wear early.
A friendly question from our blog
Want to know which thermostat saves the most? See our blog on thermostat choices and home insulation for tips that pair well with a new install.
Final calm note
A good heating system installation gives you warm nights and calm days. Avoid the seven common mistakes: wrong size, bad ducts, no permits, poor location, wrong filter, wrong controls, and missed safety checks. Take one small step today. Write down two questions for your installer. If you are in Kansas City, Malik Heating & Cooling can help pick the right unit and do the work right. You are not alone. Keep warm and take care.