Which rooms feel off?
Cold bedrooms, warm upstairs, or one side of the house that never catches up - that map steers the first checks.
Cassana HVAC LLC
Johnston climate mapped along the duct line
Residential heating and air for Rhode Island homes - start with how the house breathes, then decide what to fix. Owner Philip Mills has run Cassana HVAC since 2010.
Cobalt airflow bands, New England seasons
Climate map
Season bands that shape how Rhode Island homes breathe
Long horizontal layers - winter heat load, spring swing, summer cooling, fall prep. We read the house against the season before we open a panel.
Winter
Heat path checkShort-cycling, cold rooms, and oil-burner or furnace behavior when the load spikes.
Swing
Shoulder weeksShoulder-season imbalance when one floor lags and the system never settles.
Summer
Cooling lanesWeak airflow, warm upstairs rooms, and central air that cannot keep the map even.
Fall
Prep bandFilters, drains, and a quiet walk-through before the heating season locks in.
Service lanes
Service lanes on the climate map
Open a lane for the system you care about. Each visit starts with airflow and load - not a stacked menu of upsells.
Heating service
Furnace, boiler, and oil-burner troubleshooting when rooms stay uneven or the system short-cycles. Findings first, then a clear next step.
Cooling and central air
Cooling that feels weak, noisy, or uneven across floors. Diagnostics focus on airflow, coil condition, and how the system matches the house.
System installation
Replacement and install work planned around duct paths, clearances, and how air will actually move after the equipment changes.
Gas piping for HVAC
Gas line work tied to heating equipment - sized and routed for the appliance the house actually runs.
Refrigeration support
Refrigeration service for homes and light commercial spaces that need cold-side mechanical care alongside climate equipment.
Maintenance visits
Seasonal inspections that catch filter, drain, and airflow issues early. We document what we see so you can decide what to schedule next.
Before the visit
What we clarify before opening a panel
No staged reviews here - just the prompts that keep a callback useful.
When did the noise start?
Short-cycling, rattles, or a blower that never settles often point to airflow or control issues before parts talk.
What fuels the heat?
Oil burner, gas furnace, or boiler - knowing the fuel path keeps the visit focused on the right mechanical lane.
Duct geometry
Duct geometry we sketch on every visit
Comfort problems often live in the path of air, not only in the outdoor unit. We treat the duct map as part of the job.
- Supply runsWhere air is supposed to land - and where it stalls on the way.
- Return pathsClosed doors and starved returns that make good equipment look weak.
- Static cluesNoise, filter loading, and rooms that never balance until the path is clear.
How we work
Field habits that keep the map honest
Diagnose first
We explain what the system is doing before we talk parts or replacement.
Document the path
Notes cover airflow, fuel, and what changed - so the next visit starts smarter.
Fit the house
Install and repair choices follow how this Johnston home actually runs, not a catalog page.
Owner desk
Owner notes from Plainfield Street
Climate work is a map problem first. If the duct path and the season do not line up, new equipment alone will not fix the house. Philip Mills, Cassana HVAC LLC - since 2010
Timeline
From first call to a documented fix path
A simple sequence - no mystery steps, no arrival-time promises.
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Callback
Leave a number or dial. Philip reviews the request and confirms a visit window when he replies.
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On-site map
We walk rooms, fuel path, and airflow before tools come out - so the diagnosis matches what you feel.
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Clear options
Repair, adjustment, or replacement - explained with what we found, not a pressure script.
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Close the loop
Work gets documented so you know what changed and what to watch next season.
Leave a number - Philip calls you back
Heating or cooling questions for Johnston homes. Callback request only - timing confirmed when we reply.