At Residential Heating and Cooling, we believe that an informed homeowner is a happy homeowner. We know HVAC systems can be confusing, so we have compiled the answers to the most common questions we hear from our neighbors in Hoffman Estates.
Furnace & Heating FAQs
How long do furnaces last?
With proper maintenance, a modern gas furnace typically lasts 15 to 20 years. If your unit is approaching the 15-year mark and requires frequent repairs, it is usually more cost-effective to plan for a replacement rather than pouring money into an aging system.
Furnace Filters: Location, Replacement, and Frequency
Where is the furnace filter located?
It is usually found inside the blower compartment where the return air duct meets the furnace.
How often should I change it?
We recommend changing standard 1-inch filters every 1 to 3 months.
How do I replace a furnace filter?
Turn off the furnace, open the filter door, and slide out the old filter. Insert the new one, ensuring the arrow on the frame points toward the furnace.
Why is my furnace short-cycling (turning on and off rapidly)?
Short cycling puts massive stress on your system. Common causes include a clogged air filter, a dirty flame sensor, or an oversized furnace. If you have changed your filter and the problem persists, you likely need professional heating repair to prevent permanent damage to the heat exchanger.
Why is my furnace blowing cold air?
First, check your thermostat. If the fan is set to "ON" instead of "AUTO," the fan will blow air even when the burners are off. If the setting is correct, your pilot light may be out, or a safety limit switch may have tripped due to overheating.
Is it better to repair or replace an older furnace?
We generally follow the "50% Rule." This means if the cost of the repair is 50% or more than the cost of a new system, it’s generally smarter to invest in heating installation.
How do I know if my furnace is leaking carbon monoxide?
Carbon monoxide (CO) is odorless and invisible, which is why CO detectors are mandatory. However, visual signs include a yellow flickering burner flame, soot streaks, or excessive condensation on windows. Symptoms include headaches, dizziness, or nausea. If you suspect a leak, leave the house immediately.
How to relight the pilot light on a furnace?
Most modern furnaces use electronic ignition. If you have an older unit: Turn the gas valve to "OFF" and wait 5 minutes. Turn it to "PILOT," hold down the reset button, and light the pilot. Continue holding the button for one minute, then turn the valve to "ON."
What size furnace do I need?
Bigger is not always better. An oversized furnace will short-cycle and waste energy. The correct size depends on your home’s square footage, insulation quality, and window layout. We perform a "Manual J" load calculation to ensure the perfect fit.
How often should furnace maintenance be done?
Manufacturers require annual maintenance to keep your warranty valid. We recommend scheduling heating service every autumn to ensure your system is safe and efficient before the winter freeze hits.
Air Conditioning FAQs
Why is my AC not blowing cold air?
This is the most common summer issue. It is often caused by a dirty air filter restricting airflow, a refrigerant leak, or a frozen evaporator coil. If replacing the filter doesn't help, you likely need air conditioning repair.
Why is my AC leaking water?
Water around your indoor unit usually means the condensate drain line is clogged, causing the drip pan to overflow. It can also indicate a frozen evaporator coil that is melting. This requires immediate attention to prevent water damage.
Why is my AC running constantly?
On extremely hot days (95°F+), it is normal for your AC to run continuously to maintain the temperature. However, if it runs constantly on mild days, you may have an undersized unit, dirty coils, or a refrigerant issue.
How to clean my AC coils and drain lines?
Cleaning your coils
You can gently rinse the outdoor AC coils with a garden hose (low pressure) to remove pollen and dirt. Do not use a pressure washer.
Cleaning your drain line
Pour a cup of distilled white vinegar down the access point near your indoor unit to kill algae and prevent clogs.
You can gently rinse the outdoor AC coils with a garden hose (low pressure) to remove pollen and dirt. Do not use a pressure washer.
Cleaning your drain line
Pour a cup of distilled white vinegar down the access point near your indoor unit to kill algae and prevent clogs.
How often should AC maintenance be done?
Ideally, AC maintenance should be performed once per year.
How do I recharge my air conditioner?
Homeowners generally cannot "recharge" their own AC. It is a closed system; if it is low on refrigerant, it means you have a leak. Simply adding more fluid without fixing the leak is a waste of money.
How long do AC units last?
The average lifespan of a central air conditioner is 10 to 15 years. Regular maintenance can push this closer to 20 years, while neglect can cut it down to 8 or less.
What are BTUs?
BTU stands for British Thermal Unit. In AC terms, 12,000 BTUs equal 1 "ton" of cooling capacity.
What size AC unit do I need?
You need the right amount of BTUs to cool your square footage. If the unit is too small, it won't cool; if it's too big, it won't dehumidify. We help you find the correct size for air conditioning installation.
What is a mini split or ductless air conditioner?
A ductless HVAC system cools your home without ductwork. It consists of an outdoor compressor and wall-mounted indoor units. They are incredibly efficient and perfect for room additions or historic homes.
What temperature to set air conditioner in summer?
The Department of Energy recommends 78°F when you are home for maximum efficiency. However, comfort is personal. Every degree you raise the temperature can save you roughly 3% on cooling costs.
Heat Pump FAQs
Heat Pump Basics: How they work and how to identify them
What is a heat pump?
It is a system that heats and cools your home by moving heat rather than creating it.
How do I know if I have one?
Turn on your heat. If the outdoor unit starts running (spinning fan), you have a heat pump.
How does a heat pump work in winter?
It extracts thermal energy from the outside air, even in freezing temperatures, and moves it inside.
Can a heat pump replace my furnace?
Yes! Modern heat pumps are capable of handling Illinois winters. However, many homeowners choose a "dual fuel" system. This means they use a heat pump for mild days and a gas furnace backup for extreme cold.
Are heat pumps better than furnaces?
They are more energy-efficient, but furnaces deliver "hotter" feeling air. The choice depends on your utility costs and comfort preferences.
Sizing and Lifespan: What size do I need, and how long do they last?
What size heat pump do I need?
The size heat pump you need will be calculated by HVAC professionals. This calculation is based on your home's insulation to handle 90% of your heating needs while still dehumidifying effectively in summer.
How long does a heat pump last?
Because they run year-round, they typically last 12 to 15 years.
General HVAC Questions
What is an HVAC system?
HVAC stands for Heating, Ventilation, and Air Conditioning. It refers to the entire system responsible for moving air between indoor and outdoor areas and heating/cooling your home.
Efficiency Guide: SEER Ratings and High-Efficiency Systems
- Local Roots: A company rooted in the community (like a family-owned business).
- Reputation: Recent 5-star reviews and responsiveness.
- Transparency: Avoid phone quotes; always ask for an in-home assessment and upfront pricing.
Are high-efficiency systems worth it?
Yes. The utility savings over 15 years often pay for the upfront difference.
What SEER rating should I choose?
SEER measures efficiency. 14-16 SEER is standard and reliable. 18+ SEER offers the best humidity control and the lowest monthly bills.
How do I choose a reliable HVAC contractor?
Look for three things:
612 Albion Ave.
