Direct Answer
Standard hvac system replacement jobs in Detroit take 1-3 days. Emergency service is typically available within 2-4 hours from established local contractors. During summer, scheduling can extend 1-2 weeks — book early. Detroit permit processing typically takes 3-7 business days for standard permits.
Full Explanation
Timeline varies by scope and permit requirements. Detroit's building department at City Hall processes most residential permits in 3-7 days. Large projects may require inspections which add 1-3 days. Weather delays are common during summer.
Local Factors in Detroit
📍Peak season 'summer' adds scheduling delays
📍Detroit permit office: typically 3-7 business days
📍Emergency service: 2-4 hours from local contractors