Furnace Repairin New Hope

If your furnace in New Hope seems like it never shuts off, it can be concerning.

During Minnesota winters, longer run times are normal — but there’s a difference between steady operation and a system that can’t keep up.

At Marsh Heating & Air Conditioning, we’ve diagnosed heating performance issues since 1974. Here’s how to tell what’s normal — and what requires attention.

First: Is It Extremely Cold Outside?

When temperatures drop well below freezing in New Hope, your furnace may:

• Run longer cycles
• Operate near continuously
• Struggle during peak overnight lows

High-efficiency furnaces are designed to run longer, steadier cycles.

Long runtime during extreme cold is often normal — especially if your home maintains set temperature.

The key question is:

Is your home reaching the thermostat setpoint?

If yes, long runtime may simply reflect outdoor demand.

Dirty Air Filter

A clogged air filter restricts airflow.

When airflow is limited:

• The furnace overheats
• Efficiency drops
• Heat distribution weakens
• The system runs longer to compensate

Replacing the air filter is the safest and easiest first step.

Thermostat Set Too High

If the thermostat is set significantly higher than typical comfort range, the furnace will:

• Run continuously trying to reach that setpoint
• Struggle during cold snaps

Consider reducing the setpoint by 1–2 degrees to test performance.

Heat Loss in Older Homes

Many New Hope homes were built decades ago.

Older homes often have:

• Limited insulation
• Drafty windows
• Air leakage around rim joists
• Inadequate attic insulation

When heat escapes faster than the furnace can replace it, the system runs constantly.

In these cases, insulation improvements may be part of the solution.

Undersized Furnace

If a furnace is too small for the home:

• It will run nearly non-stop
• Struggle to reach temperature
• Increase energy bills

Improper sizing sometimes occurs when:

• Load calculations were skipped
• Additions increased square footage
• Insulation changes altered heating demand

Proper load calculation determines whether sizing is correct.

Ductwork or Airflow Problems

Restricted airflow causes:

• Uneven heat distribution
• Extended runtime
• Reduced efficiency

Common issues include:

• Closed supply vents
• Blocked returns
• Undersized ductwork
• High static pressure

Airflow evaluation is often overlooked.

Failing Components

If your furnace is aging (15–20 years old), constant running may indicate:

• Blower motor strain
• Reduced combustion efficiency
• Control board issues
• Heat exchanger wear

Older systems lose efficiency over time, requiring longer cycles to maintain comfort.

When Constant Running Is a Problem

Call for service if:

• The home never reaches the thermostat setting
• The furnace runs continuously even in moderate temperatures
• Energy bills are rising significantly
• You hear unusual noises
• The system frequently cycles on and off without stabilizing

Continuous operation combined with poor performance indicates an issue.

Preventing Constant Furnace Operation

To reduce excessive runtime:

• Replace filters regularly
• Schedule annual heating inspections
• Evaluate insulation and air sealing
• Confirm proper system sizing
• Address ductwork airflow limitations

Heating systems operate most efficiently when properly balanced.

Frequently Asked Questions

Is it bad for my furnace to run constantly?

Not necessarily during extreme cold — but constant operation during mild weather suggests a problem.

Will a smart thermostat fix constant running?

Only if the issue is scheduling or control-related. Mechanical or airflow issues require evaluation.

Does constant running increase energy bills?

Yes. Longer runtime increases fuel usage and electrical consumption.

Should I replace an older furnace that runs constantly?

If the system is 15–20 years old and struggling, replacement may be more cost-effective long term.

Heating Expertise in New Hope Since 1974

Long furnace cycles can be normal — or a sign of inefficiency.

Marsh Heating & Air Conditioning has provided furnace repair and replacement services in New Hope since 1974 with a data-driven, engineering-first approach.

If your furnace runs constantly and your home isn’t staying comfortable, call 763.536.0667 for professional evaluation.

Proper diagnosis protects both comfort and long-term efficiency.