A July condenser call and a January no-heat call cannot share one campaign
The account has two seasons with different vocabulary, different urgency and different job values, and they should never draw from the same budget.
Cooling season terms and heating season terms attract different people at different hours. A furnace that quit at 6am on a Tuesday in January is a different buyer from someone shopping a condenser replacement in July, and the ad copy that works for one is noise to the other.
Run them as separate campaigns with separate budgets, separate landing pages and separate schedules, so you can throttle one without touching the other. When the first hard freeze arrives you want a dial, not a rebuild.
Use the shoulder months deliberately. April and October are when maintenance agreements and planned replacements are sellable, and when clicks are competing against less panic. Build a campaign for that work instead of letting the emergency campaign absorb the budget year round.
One combined campaign hands the bidding system a mixed signal and it will optimize toward whatever converts cheapest, which is almost never the work you want more of.