```python
from pyaedt import Hfss, Circuit, Mechanical
from pyaedt.desktop import Desktop
import os

# Set graphical mode
Desktop(enable_desktop=True)

# Download and open a project (assuming project_path is defined)
project_path = "your_project_path.aedt"  # Define your project path here
hfss = Hfss(projectname=project_path, specified_version="2021.2")

# Start a Circuit and add HFSS dynamic link component
circuit = Circuit(specified_version="2021.2")
hfss_link = circuit.modeler.schematic.create_dynamic_link(
    hfss.design_name, hfss.solution_type, link_type="HFSS")

# Set up dynamic link options
circuit.modeler.schematic.set_sim_option(hfss_link.id, "Freq", "1GHz")

# Create ports and excitations
port1 = circuit.modeler.schematic.create_port("Port1")
excitation = circuit.modeler.schematic.create_source("V1", "Pulse", "1V", "0s", "1ns")

# Create a setup and solve the circuit, pushing excitations to the HFSS model
setup = circuit.create_setup("MySetup")
setup.props["Frequency"] = "1GHz"
circuit.analyze_setup("MySetup")

# Start Mechanical and copy bodies from the HFSS project
mechanical = Mechanical(specified_version="2021.2")
mechanical.modeler.copy_from(hfss.design_name, object_list="all")

# Get losses from HFSS and assign the convection to Mechanical
losses = hfss.post.get_losses()
for body in mechanical.modeler.get_bodies():
    mechanical.assign_uniform_convection(
        face_list=body.faces, convection_coefficient=10, ambient_temp=22)

# Plot the model
mechanical.plot(show=False)

# Solve and plot the thermal results
mechanical.create_setup("ThermalSetup")
mechanical.analyze_setup("ThermalSetup")
mechanical.post.plot_contour("Temperature")

# Release AEDT
Desktop.release_desktop()
```