Sizing Is the Foundation of Every Good Installation
An air conditioner that is too large for a Wilmette home does not cool better. It cools faster, shuts off too soon, and leaves your rooms clammy because it never runs long enough to pull humidity from the air. An undersized unit runs constantly, struggles to reach the thermostat setting on the hottest July afternoons, and wears out years ahead of schedule. Correct sizing sits at the center of every AC installation we perform, and it is the single factor that most often separates a system that lasts fifteen years from one that fails early.
At All Temp Heating & Air Conditioning, we start with a Manual J load calculation rather than a rule of thumb. This calculation accounts for your home’s square footage, ceiling heights, window count and orientation, insulation levels, and even the number of people who typically occupy the space. Wilmette has a wide range of housing stock, from older brick colonials near the lake to newer construction farther west, and each type carries a different cooling load. A one-size-fits-all approach ignores those differences and almost always leads to comfort problems down the road.
How We Choose the Right System for Your Home
Once we understand your cooling load, we help you select equipment that matches it. Air conditioners are rated by SEER2, a measure of seasonal energy efficiency. Higher SEER2 ratings mean lower operating costs, but the best choice depends on how long you plan to stay in the home, your budget, and how the system integrates with your existing ductwork and furnace blower. We walk you through these tradeoffs in plain language so you can make an informed decision rather than a rushed one.
As one of Bryant’s highest-rated dealers in the nation, All Temp Heating & Air Conditioning offers a full range of single-stage, two-stage, and variable-speed condensing units. Here is how these options generally compare for a Wilmette household:
- Single-stage systems: Run at full capacity whenever they are on. They cost less up front and suit smaller homes or tighter budgets, though they cycle more often.
- Two-stage systems: Operate at a lower level most of the time and step up to full power only on the hottest days. This produces steadier temperatures and better humidity control.
- Variable-speed systems: Adjust output continuously in small increments. They deliver the quietest operation, the most even comfort, and the strongest dehumidification, which matters during humid Chicago-area summers.
We never push you toward the most expensive option. Instead, we match the equipment to your load calculation, your home, and your goals, then explain exactly why a particular unit fits.
What the Installation Day Looks Like
A professional installation is a sequence of careful steps, not a quick swap. When our team arrives, we protect your floors and work areas, then safely recover any refrigerant from the old system in accordance with EPA regulations. We remove the existing condenser and evaporator coil, inspect the line set, and evaluate whether it can be reused or should be replaced. Reusing a line set that has carried older refrigerant without proper flushing can contaminate a new system, so we make that determination based on the condition we find, not on convenience.
Next, we set the new condenser on a level pad, install the matched evaporator coil, and connect the refrigerant lines with brazed joints. We pull a deep vacuum on the system to remove moisture and non-condensable gases, because trapped moisture can freeze at the metering device and corrode internal components over time. Only after the vacuum holds do we charge the system to the manufacturer’s specification, weighing in the refrigerant precisely rather than guessing by pressure alone. Finally, we verify airflow, check the temperature split across the coil, and confirm that the thermostat, safeties, and drain all function correctly before we consider the job complete.
Common Questions Wilmette Homeowners Ask
Many homeowners want to know whether they can keep their current furnace when replacing the air conditioner. In many cases you can, but the blower motor inside the furnace must be capable of moving the correct volume of air for the new coil. A variable-speed air conditioner paired with an older single-speed blower will not deliver its full benefit. We evaluate the whole system so the components work together rather than against each other.
Another frequent question concerns ductwork. Even a perfectly sized and installed air conditioner cannot overcome leaky, undersized, or poorly balanced ducts. Air escaping into an unconditioned attic or crawl space is cooling you paid for that never reaches your living space. During our assessment we look for obvious duct issues and recommend sealing or modifications when they will meaningfully improve comfort and efficiency. Addressing these problems during installation is far easier than revisiting them later.
Homeowners also ask how long a new system should last. With correct sizing, a quality installation, and regular maintenance, a modern air conditioner commonly serves fifteen years or more. The variables that shorten that lifespan are almost always tied to installation shortcuts and neglected upkeep rather than the equipment itself.
Applications Across Different Wilmette Homes
Older homes near the lake often have limited or no existing ductwork, having relied historically on boilers and radiators. For these properties we can discuss high-velocity or ductless mini-split solutions that provide effective cooling without tearing into finished plaster walls. Ductless systems place a compact indoor unit in each zone, giving you room-by-room temperature control and eliminating the losses associated with long duct runs.
Newer and mid-century Wilmette homes with existing forced-air heating are typically well suited to a conventional split-system air conditioner that shares the furnace blower and ductwork. Larger homes with distinct temperature zones may benefit from a zoned system with multiple thermostats and motorized dampers, so a warm second floor and a cool basement can each be conditioned independently. Whatever your layout, we tailor the design to how you actually use your space.
Why Families Choose All Temp Heating & Air Conditioning
All Temp Chicago Heating & Air Conditioning has become the first choice for tens of thousands of families throughout the Chicago and suburban areas, and that trust is built on consistent, careful work. We remain a family owned and operated company, and we treat every installation as though it were going into our own home. Our courteous, fast, and friendly staff takes the time to explain what we are doing and why, so you are never left wondering about the condition of your system.
Beyond air conditioning installation, we sell and service quality furnaces, boilers, air purifiers, humidifiers, ventilation equipment, and water heaters, and we provide expert installation, tune-up, and repair across all of them. That breadth matters because your air conditioner does not work in isolation. It shares a blower with your furnace, relies on your ductwork, and interacts with the humidity control in your home. When one company understands the whole picture, the result is a system that performs the way it should.
We proudly serve Wilmette along with Chicago, Bolingbrook, Skokie, Evanston, Lincolnwood, Morton Grove, Niles, Park Ridge, Woodridge, and Darien, IL and the surrounding communities. If you are planning to replace an aging air conditioner or add cooling to a home that has never had it, reach out to All Temp Heating & Air Conditioning. We will assess your home honestly, size the system correctly, and install it to last, so you stay comfortable through every Chicago-area summer to come.