Household electricity check-up: find the summer surge culprit

Help me do a household electricity check-up to find why the bill surged and give an actionable saving plan.

[My household situation]
- Residence type and size: (e.g., a 30-ping apartment)
- Number of residents and routine: (e.g., 2 adults 1 child, no one home during the day)
- Bills over the past six months: (list each period's amount and kWh)
- Main appliances: (how many AC units and their tonnage, fridge year, whether there's an electric water heater, dehumidifier, dryer)
- AC usage habits: (from what time to what time, set to how many degrees)

[Please output]
1. **Usage-structure estimate**: estimate roughly what proportion each appliance type accounts for, and explain the basis. Taiwan's summer bills are dominated by AC — break that out specifically.
2. **Abnormality assessment**: compared to similar households, which item of mine is clearly high? What are the likely causes?
3. **Progressive-rate impact**: explain which tier I currently fall into, and how many kWh less would drop me to the next tier and the actual savings. Explain this using Taipower's residential non-time-of-use progressive structure, and remind me to defer to Taipower's latest published rates.
4. **Three tiers of improvement**:
   - Do-immediately, zero-cost (e.g., adjust set temperature, clean the filter)
   - Small investment, pays back within six months (e.g., add curtains, switch to LED)
   - Larger investment, needs evaluation (e.g., switch to an inverter AC)
   Estimate for each "how much can be saved per month" and "payback time."
5. **One-week action list**: starting with the easiest, list concrete actions I can complete step by step within seven days.

Use Traditional Chinese with Taiwan usage, amounts in NT$. Mark all estimates as approximate and state the assumptions; actual rates are subject to Taipower's announcement.