When a Calgary home feels cold, drafty or difficult to heat, the furnace is often the first thing homeowners blame.
Sometimes that is exactly where the problem lies. An aging or poorly performing heating system can absolutely affect comfort and energy use.
But replacing the furnace is not always the whole answer.
A home works as a system. The heating equipment produces warmth, but the building envelope determines how well the house holds onto it. Attic insulation, exterior walls, basement walls, air leakage, windows and ventilation can all influence how comfortable a home feels during a Calgary winter.
That is why it can make sense to look beyond the mechanical equipment before assuming a larger or newer furnace will solve every comfort problem.
Your furnace may be working harder than it should
A heating system does not operate in isolation.
If heat is escaping rapidly through the attic, basement, exterior walls or gaps in the building envelope, the furnace has to keep replacing that lost heat.
This can lead to symptoms homeowners often associate with the furnace itself:
- rooms that never seem to warm up
- noticeable temperature differences between floors
- cold walls or floors
- drafts near exterior walls
- a furnace that runs frequently
- uncomfortable rooms even when the thermostat says the house is warm
An EnerGuide Renovation Upgrade Report looks at these components together rather than treating the heating system as the only factor.
In the sample report we reviewed, the energy advisor specifically recommended considering planned building-envelope upgrades before replacing the heating system because improving the envelope can change the heating requirements of the home.
That is an important point for homeowners.
If you significantly improve how well your house retains heat, the heating system required afterward may be different from the one you would have chosen beforehand.
Start at the top: the attic
Attic insulation can have a major effect on comfort because warm air rises and heat can escape through the upper portion of the home.
If attic insulation is insufficient, uneven, compressed or poorly installed, simply adding more heat downstairs may not solve the underlying problem.
Before adding insulation, however, there is more to consider than just R-value.
The EnerGuide sample recommends checking for roof leaks, looking for opportunities to air seal, ensuring bathroom exhaust ducts are properly vented outside and making sure attic ventilation is not blocked by insulation.
In other words, attic performance involves several systems working together.
A good insulation contractor should be looking beyond simply blowing more material into the attic.
For Calgary homeowners, this is especially important because the attic has to perform through long periods of cold weather. Air leakage from the living space into the attic can also carry warm, moist indoor air upward, which is one reason proper air sealing and ventilation matter.
If you are unsure how well your attic is performing, an insulation assessment can help identify whether there are gaps, low areas or other obvious deficiencies.
A local Calgary attic insulation contractor such as IDEAL Insulation can assess the insulation side of the home and help determine whether improving the attic or other parts of the building envelope should be part of the overall comfort plan.
Air leakage can undermine good insulation
Insulation slows heat transfer, but uncontrolled air movement can still make a home uncomfortable.
Small gaps around penetrations, framing connections and other parts of the building envelope can collectively allow a surprising amount of air movement.
The EnerGuide report describes air sealing as one of the more cost-effective energy-saving measures and notes that it can help reduce drafts, heat loss, dust and outdoor noise.
This is why a home can technically have insulation and still feel drafty.
Think of winter clothing. A thick jacket helps keep you warm, but if it is left open, cold air can still move through it.
Homes can behave similarly.
That is also why simply increasing furnace output is not always the most efficient answer. If the house is losing heated air or allowing cold outside air to enter continuously, the mechanical system is being asked to compensate for a building-envelope problem.
Do not forget the basement and foundation
Cold basements are another common comfort complaint.
The EnerGuide sample found foundation-related heat loss important enough to recommend additional basement-wall, pony-wall and foundation-header insulation.
That does not mean every Calgary basement requires the same upgrade. Existing construction, moisture conditions, insulation levels and renovation plans all matter.
One particularly important point from the report is that moisture issues should be addressed before beginning foundation-insulation work.
Insulating over an unresolved water problem can create a much more expensive problem later.
For homeowners planning to finish or renovate a basement, this is a good reason to think about insulation and moisture management before the walls are closed up and finished.
Exterior walls can matter too
Wall insulation is harder to change than attic insulation, which is why it is often overlooked.
But if you are already planning a significant renovation, replacing siding or changing windows, it can be worth looking at the wall assembly at the same time.
The sample EnerGuide report recommends additional exterior-wall insulation and discusses the benefit of continuous insulation in reducing thermal bridging through the framing.
This is one reason energy upgrades are often most cost-effective when coordinated with other renovations.
Opening walls or replacing exterior finishes purely to add insulation can be expensive. But when those areas are already accessible as part of another project, the economics can change considerably.
What about windows?
Cold windows often get blamed for an uncomfortable home, and old or damaged windows certainly can contribute to heat loss.
But window replacement is not always the first energy upgrade that makes sense.
Interestingly, the EnerGuide sample placed window replacement below several other upgrades and noted that the energy-savings return can be relatively low compared with the cost of replacement.
That does not mean new windows are a bad investment.
Homeowners may replace them for comfort, condensation reduction, appearance, noise reduction, maintenance or because the existing windows are failing.
The broader lesson is simply that a whole-home assessment can help you prioritize upgrades instead of automatically replacing the component that feels coldest to the touch.
Ventilation becomes more important as homes get tighter
There is another side to improving airtightness.
A tighter home generally loses less uncontrolled air, but homes still need fresh air. Indoor air quality is another important part of how the home performs as a complete system.
The EnerGuide report we reviewed actually recommended a heat recovery ventilator or energy recovery ventilator because the assessed home was already relatively airtight.
HRVs and ERVs are designed to exchange indoor and outdoor air while recovering some of the energy that would otherwise be lost through ventilation.
Depending on the home’s HVAC system and the source of the comfort issue, other solutions such as Hoyme dampers may also help improve airflow and comfort in basement areas.
This is where coordination between insulation and Calgary Home Comfort HVAC professionals becomes particularly useful.
An insulation contractor may identify opportunities to improve the building envelope, while an HVAC professional can evaluate heating, cooling, ventilation and indoor air quality needs after those changes are taken into account.
The best solution may involve both HVAC and insulation
The important question is not:
“Is this a furnace problem or an insulation problem?”
Sometimes it is both.
A poorly performing furnace should not be ignored simply because the attic needs more insulation. Likewise, a brand-new furnace cannot completely compensate for major heat loss through an under-insulated or leaky building envelope.
For Calgary homeowners dealing with persistent comfort problems, the better approach is to look at the house as a complete system.
Before replacing or upsizing heating equipment, consider:
- Is the attic adequately insulated?
- Are there obvious air leaks?
- Does the basement or foundation contribute to cold areas?
- Are some exterior walls poorly insulated?
- Are there moisture or ventilation concerns?
- Do you change your furnace or heat pump filter regularly?
- Is your furnace or heat pump maintained annually?
- If your home has an HRV or ERV, is it being maintained according to the manufacturer’s recommendations?
- Are the home’s air ducts properly installed and balanced?
- Have changes such as a higher-CFM range hood affected the home’s ventilation or air pressure?
- Are other renovations planned that could make insulation upgrades easier?
- Has the heating system been properly sized for the current condition of the home?
Clean Secondary Heat Exchanger vs. Well-Maintained Heat Exchanger
Dirty Air Filter vs. Clean Air Filter
Lack of Venting in the House
The goal is not simply to generate more heat.
It is to create a home that can produce, distribute and retain heat efficiently.
That is where coordination between experienced HVAC professionals and building-envelope specialists can make a significant difference.
Calgary Home Comfort can help homeowners assess the heating and ventilation side of the equation, while insulation specialists such as IDEAL Insulation can help evaluate whether the building envelope is contributing to comfort or energy-loss problems.
An older furnace may itself be contributing to comfort or efficiency problems, particularly if the system is approaching the end of its service life or is no longer performing as intended. However, if you have a newer, high-efficiency heating system and still experience significant temperature differences between rooms, the issue may lie elsewhere, such as poor air circulation, ductwork, air leakage or insulation. Calgary Home Comfort can assess the HVAC side of the home and help determine where the problem may be coming from.
Calgary Home Comfort offers HVAC services and solutions designed to improve heating, cooling and overall comfort in Calgary homes. But before assuming the furnace is the only problem, it is worth finding out where your heat is actually going.
Calgary Home Comfort
