Heating & Cooling

You almost never touch the furnace itself. Day to day, this system is the Ecobee thermostat and the vents.

A forced-air gas furnace works in three simple steps: it draws in room air through return grilles, heats that air by burning natural gas across a heat exchanger, and pushes the warmed air back out through supply registers (the vents you feel air coming from) using a blower fan. The thermostat is the brain that decides when this cycle runs and for how long.

1. Set your target temperature on the Ecobee — that is the only day-to-day control for this system.
2. Leave supply registers and return grilles unblocked — furniture, rugs, and curtains over a vent choke airflow and make rooms uneven.
3. If a room runs hot or cold relative to the rest of the house, adjust that room’s register (open/close the damper blade at the vent) a little at a time rather than changing the thermostat.

Whole-house ventilation

The house also has a controlled fresh-air ventilation system, separate from heating and cooling: a Honeywell Whole House Ventilation Control on the furnace cabinet brings in a metered dose of outdoor air on a schedule, rather than relying on incidental air leakage through the house. It works alongside the furnace and the Ecobee but is its own system, with its own switch.

The control has a three-position slide switch, set to the position you want for ordinary living: On / Optimized Ventilation — the control decides when to bring in fresh air, generally avoiding the most extreme outdoor temperatures. Override ventilates immediately for a set time (useful after painting, heavy cooking, or a party). Off / Remote Only stops automatic ventilation and waits for a separate remote or wall control to call for it.

• Filter changes: every 6 months, per the unit’s own service sticker (this is a media filter, not a 1"/monthly type) — the Ecobee also tracks runtime and can remind you.
• Spares are already on hand, and convey: there are at least two spare 20¾" × 27¾" MERV 8 filters in the house, plus a box of assorted fuses that includes the fuses this HVAC system uses. In practice the first year of filter changes is covered without a shopping trip, and a blown control-board fuse — the classic "furnace is completely dead but the breaker is fine" fault — can be fixed the same evening rather than waiting on a service call. To do at walkthrough: find both stashes, count what is there, and note where they are kept.
• Where the filter lives: in the filter cabinet mounted directly on the furnace, not at a central return grille.
• Registers & returns: vacuum supply registers and return grilles occasionally — dust buildup on a return grille is a quiet but real airflow restriction, same as a dirty filter.
• Annual professional service: the service sticker calls for this explicitly to preserve the warranty. HeatGuy LLC (Vancouver, WA — see Specs) is the contractor named on the unit; call to confirm whether they’re still under contract and to get on their annual reminder list. Standard scope: combustion safety check, heat exchanger inspection, blower and burner cleaning, plus a separate AC check in spring.
• Outdoor AC condenser: the Rheem RA1342AJ1NA sits on its own concrete pad against the house, set flush with a bark-mulch bed — which means bark, leaves and blown debris collect against the coil more easily than they would on a raised pad. Keep at least 2 ft clear on all sides and rinse the coil fins gently with a hose once a season; check it a little more often than the "once a season" rule of thumb given the mulch-level mounting.
• AC disconnect — no fuses inside: the grey box on the siding directly above the condenser is a Siemens WN2060, 60 A, non-fused pullout switch. Pulling the block only breaks the circuit mechanically — there is nothing inside it to blow or replace. If the AC is dead, the fault is at the breaker in the main panel or in the equipment itself, not in this box.
• Whole-house ventilation — the Service light: the Honeywell control on the furnace cabinet has a separate Service indicator next to its main status LED. If it lights, the system is asking for attention (most likely the outdoor intake needs checking) — treat it as a maintenance reminder, not an emergency. To gather: where the outdoor fresh-air intake hood terminates, so it can actually be checked for blockage.

• No heat at all: first confirm the Ecobee is powered and set to Heat with a target above room temperature (see the Ecobee troubleshooting section for thermostat-side checks — blank screen, power, WiFi). If the thermostat looks fine and there is still no heat, follow the No-heat runbook for the full symptom → check → fix → call-a-pro sequence.
• Weak airflow / rooms not getting warm: check the filter first — a clogged filter is the single most common cause of weak airflow. Then confirm no registers or returns are blocked by furniture or closed dampers. If airflow is still weak after a fresh filter and open vents, that points to the blower or ductwork and is a call-a-pro item.
• Short-cycling (furnace turns on and off repeatedly in short bursts): the most frequent causes are a dirty filter (starves airflow, triggers a high-limit safety shutoff), a thermostat located somewhere unrepresentative of the room, or a furnace oversized for the space. Start with a filter check; if short-cycling continues with a clean filter, it needs a technician — repeated short-cycling wears out furnace components faster than normal operation.
• Furnace runs but the house never reaches temperature: check the filter, then check that all registers are open and unblocked. If those are fine, this can indicate duct leakage or a mechanical fault — a technician visit is the next step.
• AC not cooling: confirm the Ecobee is set to Cool with a target below room temperature. If the outdoor condenser still isn’t running, check the double-pole breaker for the AC in the main panel first — the wall-mounted Siemens WN2060 disconnect beside the condenser is non-fused, with nothing inside it to check; it only pulls out and reseats. See the Breaker trips runbook.
• Smell of gas near the furnace: this is not a troubleshooting item — leave the house, do not operate switches or the thermostat, and call the gas utility’s emergency line from outside. Treat any gas smell as an emergency, not a maintenance task.

The furnace’s exact model is not yet in hand (the rating plate is behind the lower access door), so no model-specific PDF can be archived for it yet. The Ruud brand and series are established, so the manufacturer’s own product and support pages are linked below alongside general authoritative guidance.

• Ruud — Gas Furnaces (Ultra Series lineup)
  Official Ruud product family page — the Ultra Series is shown here; narrows once the exact model is in hand.
• Ruud — document & manual search
  Official Ruud document search — searchable by model number once the rating plate is read.
• Ruud/Rheem (-)96V Series gas furnace — owner’s manual (PDF)
  Covers the "(-)96V Series" platform shared by Rheem R96V and Ruud U96V badges. Archived via archive.org (myrheem.com's doc-store domain is unreachable live). Series-level.
• HeatGuy LLC — official site (named service contractor)
  The contractor named on the furnace’s own service sticker; installs and services Ruud and Daikin equipment in the Vancouver, WA area.
• ENERGY STAR — Furnaces & HVAC maintenance guidance
  General filter cadence and system-care recommendations.
• ACCA — Home HVAC maintenance overview
  Air Conditioning Contractors of America — industry-standard service-interval guidance (annual professional service).